The Travel Demand 

Model for the Macon 

Area 

 

Prepared for 

Georgia Department of 

Transportation 

By 

 

January 2009 
TABLE OF CONTENTS 

List of Tables ....................................................................................................................................... i 

List of Figures .................................................................................................................................... ii 

1.0 Introduction .................................................................................................................................1 

2.0 Model Update ..............................................................................................................................2

2.1 Highway Network Coding .............................................................................................................................. 3

2.2 Trip Generation ............................................................................................................................................. 8

2.2.1 Trip Purposes ........................................................................................................................................................ 8

2.2.2 Socioeconomic Data ............................................................................................................................................. 9

2.2.3 Household Stratification Model ........................................................................................................................ 10

2.2.4 Trip Production .................................................................................................................................................. 13

2.2.5 Trip Attraction Submodel .................................................................................................................................. 14

2.2.6 External-External Trips ..................................................................................................................................... 16

2.2.7 Special Generators ............................................................................................................................................. 16

2.2.8 Balancing Productions and Attractions ............................................................................................................ 16

2.3 Trip Distribution .......................................................................................................................................... 17

2.4 Mode Split .................................................................................................................................................... 19

2.5 Traffic Assignment ...................................................................................................................................... 20

2.5.1 Model Calibration ............................................................................................................................................... 21 

2.5.2 Delta Matrix Process ........................................................................................................................................... 30

Appendix A: Socio-Economic Variables By Zone for 2006 ........................................................32 

Appendix B: Production and Attraction Trip Ends By Zone for 2006 .....................................41 
Appendix C: Travel Demand Model Validation Sample Report ................................................51 
i Model Development Documentation 

List of Tables 

Table 2.1-1 Facility and Area Types ..........................................................................................5 

Table 2.1-2 Hourly Capacities ....................................................................................................5 

Table 2.1-3 Speed Matrix ...........................................................................................................6 

Table 2.1-4 Input Network Link Attributes ................................................................................7 

Table 2.1-5 Input Network Node Attributes ...............................................................................7 

Table 2.2.3-1 2000 Household Size CTPP Distribution ..............................................................12 

Table 2.2.3-2 2000 CTPP Household Income Distributions .......................................................12 

Table 2.2.3-3 Household Size/Income//Auto Ownership Distribution ........................................13 

Table 2.2.4-1 Trip Generation Trip Rates ....................................................................................14 

Table 2.2.5-1 Proportion of External-Internal Trips by External Station ....................................15 

Table 2.3-1 Terminal Time Criteria ..........................................................................................17 

Table 2.3-2 Average Trip Travel Times ...................................................................................18 

Table 2.4-1 Vehicle Occupancy Rates ......................................................................................20 

Table 2.5-1 Output Network Attributes ....................................................................................20 

Table 2.5.1-1 Summary of the Screenlines ..................................................................................23 

Table 2.5.1-2 Screenline/Cutline Results.....................................................................................23 

Table 2.5.1-3 Model VMT Statistics ...........................................................................................28 
ii Model Development Documentation 

List of Figures

Figure 1.1-1 Travel Demand Models ...........................................................................................2 

Figure 2.1-1 MATS 2006 Highway Network ..............................................................................4 

Figure 2.2.2-1 Traffic Analysis Zones ..........................................................................................10 

Figure 2.5.1-1 Screenline Locations .............................................................................................22 

Figure 2.5.1-2 2006 Travel Demand Model Scatter Plot ..............................................................27 

Figure 2.5.1-3 2006 Travel Demand Model Maximum Desired Deviation Chart ........................29 

Figure 2.5.1-4 2006 Travel Demand Model Maximum Desired Deviation Map .........................29 

Figure 2.5.2-1 Delta Matrix Process .............................................................................................30 
Macon Model 2006 Base Year Update 

1 Model Development Documentation 

1.0 Introduction 

Transportation system studies are done periodically by the Georgia Department of 

Transportation, MATS and the MBTA to determine what types of transportation improvements 

or investments would best serve the public. Georgia DOT and MATS are primarily responsible 

for technical studies pertaining to the roadway system while the MBTA conducts studies of 

transit service. 

The travel demand model is used to evaluate the performance of the roadway system in and 

around Macon by the Georgia Department of Transportation and MATS. The MATS model is a 

traditional urban area analysis tool that is used to identify where major improvements should be 

made to its principal thoroughfare system. Since there is usually more than one strategy 

proposed to address future congestion and safety concerns, the model is frequently used to study 

which combination of improvements provides the most end-user benefits. The output from the 

travel demand model is used to estimate mobile source emissions and perform the conformity 

analysis. 

There are two key inputs to the travel demand modeling process, socio-economic data and the 

transportation system. Socio-economic data such as population, household and employment by 

type represents land use. Future year projections of socioeconomic data were based on a 2006 

inventory of existing land uses including vacant land, as well as region wide forecasts of 

population, households and employment. Future year forecasts also considered planned major 

transportation improvements. Allocation of expected growth is then done using known 

development patterns and proposals as the basis, taking into consideration planned infrastructure 

improvements (new highways, sewer extensions, etc.). It is in this area of travel model 

development that land use and community planning are connected to the transportation planning 

process. Figure 1.1-1 shows the interaction between travel demand models and transportation 

system characteristics and population and employment characteristics 

The other key element of the travel model is referred to as the highway network. The highway 

network is a computer file containing links and nodes that represent roadway segments and 

intersections. Each link record in the file contains information describing these items: free-flow 

travel speed, distance, number of lanes, area type (density of population and employment); 

facility type (similar to functional classification) and capacity. Node records simply contain 

positional, two dimensional x and y coordinates to enable the network file to be displayed 

pictorially. 
Macon Model 2006 Base Year Update 

2 Model Development Documentation 

Figure 1.1-1 

Travel Demand Models 

Georgia DOT is responsible for the development, maintenance and application of the MATS 

travel model. GDOT has updated various components of the MATS travel model to ensure that 

the model is state-of-the-practice and includes technical procedures that would be needed in 

developing the 2035 LRTP. A detailed description of the MATS’ travel model is presented in 

Section 2. It includes explanations for how trips are estimated, how person trips are converted to 

vehicle trips, what attributes comprise the highway network and how trips are assigned onto the 

highway network. Each of the modeling steps involved in developing an urban travel model is 

described. These steps are as follows: Trip Generation; Trip Distribution; Mode Split; and 

Traffic Assignment. 

2.0 Model Update 

Several significant changes were made to the Macon area travel model. These changes are based 

on the original 2002 model and listed below. 

• Updated the 1990 HPMS functional classification code to 2000 HPMS code in the 

network 

• Updated base year highway network and trip generation for 2006 to 2035 

• Updated the trip distribution model 

Travel 

Demand 

Models 

Transportation 

System 

Characteristics 

Population and 

Employment 

Characteristics 

Forecasting 

Transportation 

System 

Performance 

Forecasting How 

Changes Might 

Affect Future 

Performance 

Source: Introduction to Travel Demand Forecasting 
Macon Model 2006 Base Year Update 

3 Model Development Documentation 

• Updated the traffic assignment procedure 

• Updated external trip data sets to 2006 and 2035 levels 

• Split five existing TAZs (240, 253, 254, 269, 402) into 11 new zones 

• Added the new zones in the network (zone 404-409) 

• Renamed the external stations (from 404-430 to 414-440) to accommodate new 

zones 

• Updated external trip data sets to 2006 and 2035 levels 

• Updated network coordinate system from “NAD 1983 StatePlane Georgia West” 

(Unit as Mile) to “NAD_1983_Georgia_Statewide_Lambert” (Unit as Feet) 

• Added the delta matrix post-process procedure to refine the final traffic assignment 

The general structure of the Macon model is standard, in comparison with other travel demand 

models used in urban areas that are similar in size to Macon. Descriptions of each principal 

model element are presented in the subsequent parts of this section. 

2.1 Highway Network Coding 

The model network was updated to reflect 2006 conditions. The 2006 highway network was 

closely examined and revised to reflect base year conditions. The purpose of the highway 

network is to provide accurate routing paths based on the minimum time to travel from one 

traffic analysis zone to another. In effect, the highway network file is a simulation tool 

replicating the thoroughfare system in Macon, Bibb County and part of Jones County. A 

graphical representation of the model highway network by facility type is presented in Figure 

2.1-1. 
Macon Model 2006 Base Year Update 

4 Model Development Documentation 

Figure 2.1-1 

MATS 2006 Highway Network 

Color Coded by 2000 HPMS Functional Classification 

Legend 

--Interstate Freeway 

-- Principle Arterials 

-- Minor Arterials 

= Collectors 

-- Local Roads 
Macon Model 2006 Base Year Update 

5 Model Development Documentation 

Facility Type and Area Type. Individually and in combination these two link attributes 

provide the framework for organizing the network into sub-groups so that free-flow speeds and 

capacities can be assigned. In combination with the distance and number of lanes, these 

attributes constitute the base layer of highway network data needed to update and apply the 

travel model. The facility type and area type definitions used in the MATS highway network 

and modeling process are shown in the table below. 

Table 2.1-1 

MATS Travel Demand Model – Facility and Area Types

Code Facility Type Code Area Type 

1 Interstate 1 High Density Urban 

2 Freeway 2 High Density Urban Commercial 

3 Expressway 3 Urban Residential 

4 Parkway 4 Suburban Commercial 

6 Freeway to Freeway Ramp 5 Suburban Residential 

7 Freeway Entrance Ramp 6 Exurban 

8 Freeway Exit Ramp 7 Rural 

11 Principal Arterial – Class I 

12 Principal Arterial – Class II 

13 Minor Arterial – Class I 

14 Minor Arterial – Class II 

15 One Way Arterial 

21 Major Collector 

22 Minor Collector 

23 One Way Collector 

30 Local Road 

32 Centroid Connector 

Capacity. Link capacities for the model network are obtained from a lookup table of per-lane 

hourly capacities based on facility type and area type. The final link capacity is calculated by 

multiplying the hourly capacity per lane by the number of lanes. The following table displays 

the hourly capacities per lane: 

Table 2.1-2 

MATS Travel Demand Model – Hourly Capacities Per Lane 

Facility Type 

Area Type 

1 2 3 4 5 6 7 

Interstate 1900 1950 2000 2050 2100 2060 2020 

Freeway 1600 1660 1730 1790 1850 1820 1780 

Expressway 1300 1380 1450 1530 1600 1570 1540 

Parkway 1170 1240 1310 1370 1440 1410 1380 

Freeway to Freeway Ramp 1400 1530 1650 1780 1900 1860 1820 

Freeway Entrance Ramp 900 1030 1150 1280 1400 1370 1340 

Freeway Exit Ramp 800 810 810 820 820 810 790 

Principal Arterial – Class I 1000 1030 1050 1080 1100 1080 1060 

Principal Arterial – Class II 900 900 900 900 900 880 860 

Minor Arterial – Class I 800 810 810 820 820 810 790 
Macon Model 2006 Base Year Update 

6 Model Development Documentation 

MATS Travel Demand Model – Hourly Capacities Per Lane 

Facility Type 

Area Type 

1 2 3 4 5 6 7 

Minor Arterial – Class II 630 630 640 640 640 630 610 

One Way Arterial 760 760 770 770 770 760 740 

Major Collector 520 530 540 550 560 550 540 

Minor Collector 380 390 390 400 400 390 380 

One Way Collector 460 470 470 480 480 470 460 

Local Road 340 350 360 370 380 370 360 

Centroid Connector 0 0 0 0 0 0 0 

Speeds. Link speeds in the model network are derived from a speed lookup table based on 

facility type and area type. Assumed free-flow speed are approximately 5 mph faster than typical 

speed limits for the various roadway classes and area types, taking into consideration control for 

delay (i.e. traffic signals) if applicable. Peak and off-peak free-flow speeds were evaluated using 

observed speeds obtained from a travel time study conducted in the Augusta area. Based on the 

initial study of the speeds, a revised speed table was developed. An analysis of the Augusta data 

determined that Augusta’s characteristics and data results are appropriate for use in the Macon 

model since the travel dynamics for these urban areas are very similar. Final free-flow calibrated 

speeds are shown in the matrix below. 

Table 2.1-3 

MATS Travel Demand Model – Speed Matrix 

Facility Type 

Area Type 

1 2 3 4 5 6 7 

Interstate 55 60 60 60 60 70 70 

Freeway 50 55 55 55 55 60 60 

Expressway 50 50 50 50 55 55 55 

Parkway 45 50 50 50 50 55 55 

Freeway to Freeway Ramp 55 55 55 55 55 55 55 

Freeway Entrance Ramp 45 50 50 50 50 55 55 

Freeway Exit Ramp 22 23 30 31 34 40 48 

Principal Arterial – Class I 22 28 33 34 37 47 52 

Principal Arterial – Class II 23 26 31 32 35 45 49 

Minor Arterial – Class I 22 23 30 31 34 40 47 

Minor Arterial – Class II 21 22 27 30 32 38 45 

One Way Arterial 23 26 30 32 35 42 48 

Major Collector 17 18 21 27 29 34 42 

Minor Collector 14 15 18 24 26 30 40 

One Way Collector 17 18 21 27 29 34 42 

Local Road 14 14 17 18 22 28 35 

Centroid Connector 14 14 17 18 22 28 35 

Network Link Attributes. All input network link attributes are included in the following table. 

While most of them are not directly involved in the model process, they provide assistances in 
Macon Model 2006 Base Year Update 

7 Model Development Documentation 

link attributes summary for post model result processing and for model calibration and 

validation. 

Table 2.1-4 

MATS Travel Demand Model – Input Network Link Attributes 

Attribute Name Description 

Area Area Type (automatically added) 

Lanes Number of Lanes 

Distance Roadway Link Length in miles 

County County FIPS Code 

Cstation Traffic Count Station Number 

Count02 2002 AADT - One Way 

Screenline Screenline ID 

UAB Urbanized Area Code 

HPMS1990 HPMS Functional Classification Code, 1990 

Roadname Roadway Name 

Ftype Facility Type 

Tcount02 2002 AADT - Two Way 

Tcount06 2006 AADT - Two Way (from GDOT QA/QC Database) 

Trkpct06 Truck Percent 2006 

HPMS2000 HPMS Functional Classification Code, 2000 

Count06 2006 AADT - One Way 

GDOT_PI GDOT Project Identification Number 

Local_PI Local Project Identification Number 

Open_date Model Year Open to Construction 

Network Nodes Attributes. The network node contains three attributes designated to identify 

the accessibility of a node. Only the centroid nodes of the network are attached with these 

attributes which use “1” to indicate the availability of transit. The level of the accessibility is 

shown in the following table. 

Table 2.1-5 

MATS Travel Demand Model – Input Network Node Attributes 

Attribute Name Description 

Transit1 Centroid within 0.25 miles of transit access 

Transit2 Centroid within 0.50 miles of transit access 

Transit3 Centroid within 1.00 miles of transit access 
Macon Model 2006 Base Year Update 

8 Model Development Documentation 

2.2 Trip Generation 

Trip generation is the first step in the traditional four-step modeling process. It estimates the 

number of trips that will begin and end in each individual traffic analysis zone (TAZ). These 

are referred to as “trip ends”. Trip ends generated by households are referred to as productions. 

Trip ends calculated from employment or school enrollment figures are referred to as attractions. 

This process is accomplished by establishing relationships between trips and socioeconomic 

variables. The process estimates the number of trip ends, or productions and attractions, for each 

traffic zone by various trip purposes. Trip generation does not determine the origin and 

destination of each trip, only the total trips generated by each TAZ's socioeconomic 

characteristics. 

In 1997, GDOT contracted with a consulting firm to assist in developing a new standardized trip 

generation process for the state’s urbanized areas outside of Atlanta. The Trip Generation 

Update Project included a household travel survey and external travel survey in the Augusta 

metropolitan area. Household travel behavior by household size and income group is 

homogeneous from one urban area to another if transportation choices and land-use patterns are 

similar. The Augusta survey information was used to formulate and recommend a trip 

generation process that is considered transferable to the State’s other urbanized areas. 

The new trip generation process includes trip production and trip attraction sub-models. For all 

trips that have origins and destinations inside the MATS region, excluding trucks, the trip 

production sub-model applies trip rates through a cross-classification of household size 

(1,2,3,4+) and automobiles available (0,1,2,3+). Aggregate household data for each traffic 

analysis zone is disaggregated into sixteen cross-classified cells using a household stratification 

model. The household stratification model is also a product of the Trip Generation Update 

Project. This model breaks out the total number of MATS households into cross-classification 

cells using zonal income, Macon area specific data from the Census Transportation Planning 

Package (CTPP), and data from the Augusta household survey. The trip production sub-model 

applies regression equations for other trip purposes. The trip attraction sub-model applies 

regression equations for all trip purposes. 

Typically, there are three types of trips that travel demand models include: (1) Internal-Internal 

(I-I) trips whose origin and destination are inside the study area boundary; (2) Internal-External 

(I-E) trips that have exactly one trip end inside the study area; and (3) External-External (E-E) 

trips that have both trip ends outside of the study area. I-I trips follow the production and 

attraction logic of trip formulation. They are commonly grouped into trip purposes so their 

characteristics can be reproduced by the chain of sub-models in the four-step process. I-E and EE trips are developed separately using a different methodology that is heavily dependent on 

traffic counts observed on the principal roads leading into and out of the region. 

2.2.1 Trip Purposes 

Seven trip purposes were included in the trip generation process. These purposes are 

summarized below: 
Macon Model 2006 Base Year Update 

9 Model Development Documentation 

1. Home Based Work (HBW): All travel made for the purpose of work and which

begins or ends at the traveler’s home. 

2. Home Based Other (HBO): Any trip made with one end at the home except those

for the purpose of work or shopping. 

3. Home Based Shopping (HBS): Trips made for the purpose of shopping and which 

begins or ends at the traveler’s home. 

4. Non Home Based (NHB): Any trip that neither begins nor ends at home. 

5. Internal-Internal Truck (IIT): Internal trips made by commercial vehicles. 

6. Internal-External Passenger Car (IEPC): Internal trips beginning or ending 

outside the modeled area, excluding trucks. 

7. Internal-External Truck (IET): Internal truck trips beginning or ending outside the 

modeled area. 

2.2.2 Socioeconomic Data 

The MATS provided 2006 Base Year socioeconomic data for the model. For each of the 409 

traffic analysis zones (TAZ’s) the following socioeconomic variables were collected for use in 

the trip generation model: 

Population: The total number of individuals that are residing in each traffic zone. 

Retail Employment: Number of employees working for retail businesses in a given 

traffic analysis zone where the business is located. 

Industrial Employment: Number of employees working for industrial based businesses 

in a given traffic analysis zone where the business is located 

Service Employment: Number of employees working for service based businesses in a 

given traffic analysis zone where the business is located. 

Total Employment: The total number of employed persons in those traffic zones with 

employment. 

Income: Average household income in TAZ in 2000 dollars (per 2000 Census). 

Total Households: Total number of occupied households in a given traffic analysis zone. 

School Enrollment: The total number of enrolled students in zones with educational 

facilities. 

Acres: Area of TAZ in acres. 

Appendix A contains the zonal level socioeconomic data used in the travel demand model for 

2006. An illustrative picture of the zone boundary map is presented in Figure 2.2.2-1. There are 
Macon Model 2006 Base Year Update 

10 Model Development Documentation 

409 internal zones in the MATS model with 27 additional zones called external stations. The 

external station zones represent the key facilities where travel in and out of the MATS region 

occurs such as I-75, I-475 and I-16. 

Figure 2.2.2-1 

Map of Traffic Analysis Zones 

2.2.3 Household Stratification Model 

The household stratification model subdivides the total number of households by TAZ into 

sixteen household strata defined by household size and the number of automobiles available. 

Stratification is done using zonal income, Macon area specific data from the Census 

Transportation Planning Package (CTPP), and data from the Augusta household survey. The 

model distributes the total households in a TAZ to each cross-classification cell by calculating a 
Macon Model 2006 Base Year Update 

11 Model Development Documentation 

relative1probability that a household will be a particular size with a particular number of 

automobiles. The relative probability is calculated with the following equation: 

 P(i,j) = S * I * CF, where 

P(i,j) = Relative probability that a household will be size i and own j autos 

S = Household size factor from CTPP lookup table 

I = Income factor from CTPP lookup table 

CF = Composite household factor from Augusta household survey lookup table. 

An estimate of the number of households in a particular cross-classification cell is then 

calculated by multiplying the total number of households in the TAZ by the corresponding 

relative probability. The final number of households in each cross-classification cell is calculated 

by applying an adjustment factor to each calculated value. The adjustment factor is applied to 

insure that the sum of the resulting disaggregated households equals the original aggregate 

number of households. This process is represented mathematically with the following equations: 

HHij(est.) = HH * P(i,j), where 

HHij(est.) = Estimated number of households of size i that own j autos 

HH = Total number of households in the TAZ 

HHij = HHij(est.) * F, where 

HHij = Final number of households2

 of size i that own j autos 

F = HH / ΣHHij(est.), control total adjustment factor. 

The three lookup tables used in the household stratification model are shown on the following 

pages. 

 

1 The term relative probability is used because the value is not technically a statistical probability. 

2 Not rounded to an integer value to eliminate problems with round off errors. 
Macon Model 2006 Base Year Update 

12 Model Development Documentation 

Table 2.2.3-1 

MATS 2000 Household Size CTPP Distribution

Computed 

Persons/HH 

Ranges 

HOUSEHOLD SIZES 

1 2 3 4+ 

0.00 to 1.00 1.0000 0.0000 0.0000 0.0000

1.00 to 1.20 0.8839 0.0804 0.0357 0.0000

1.20 to 1.40 0.7353 0.1706 0.0553 0.0388

1.40 to 1.60 0.6200 0.2581 0.0791 0.0428

1.60 to 1.80 0.4562 0.3624 0.0991 0.0823

1.80 to 2.00 0.3849 0.3900 0.1072 0.1179

2.00 to 2.20 0.3445 0.3600 0.1425 0.1530

2.20 to 2.40 0.2755 0.3461 0.1806 0.1978

2.40 to 2.60 0.2232 0.3267 0.2012 0.2489

2.60 to 2.80 0.1969 0.3178 0.1978 0.2875

2.80 to 3.00 0.1541 0.2818 0.2123 0.3519

3.00 to 3.20 0.1400 0.2457 0.2137 0.4006

3.20 to 3.40 0.1300 0.2176 0.2035 0.4489

3.60 to 3.80 0.1200 0.2158 0.1912 0.4730

3.80 to 4.00 0.1100 0.2100 0.1789 0.5011

4.00 to 4.20 0.0700 0.1600 0.1200 0.6500

4.20 to 4.40 0.0900 0.1800 0.1400 0.5900

4.40 to 4.60 0.0300 0.1300 0.1400 0.7000

4.60 to 4.80 0.0500 0.1400 0.1079 0.7021

4.80 to 5.00 0.0300 0.1200 0.1000 0.7500

Table 2.2.3-2 

MATS 2000 CTPP Household Income3 Distributions

TAZ-Level Median HH 

Income

Income 

Group 1 

Income 

Group 2 

Income 

Group 3 

Income 

Group 4 

$0 $4,999 0.8732 0.0981 0.0144 0.0144

$5,000 $9,999 0.7132 0.1863 0.0610 0.0396

$10,000 $14,999 0.5830 0.2553 0.1005 0.0612

$15,000 $19,999 0.4239 0.3674 0.1264 0.0823

$20,000 $24,999 0.3566 0.3151 0.2009 0.1275

$25,000 $29,999 0.2514 0.3005 0.2790 0.1691

$30,000 $39,999 0.1760 0.2859 0.2996 0.2386

$40,000 $49,999 0.1174 0.2065 0.3012 0.3749

$50,000 $59,999 0.0889 0.1783 0.2509 0.4818

$60,000 $69,999 0.0605 0.1123 0.1804 0.6469

$70,000 $79,999 0.0476 0.1004 0.1766 0.6754

$80,000 $89,999 0.0346 0.0885 0.1535 0.7233

$90,000 $99,999 0.0095 0.0870 0.1406 0.7629

$100,000 $109,999 0.0075 0.0851 0.1202 0.7872

$110,000 $119,999 0.0055 0.0825 0.0949 0.8171

$120,000 $124,999 0.0035 0.0800 0.0765 0.8400

 

3 Income Group 1: <=$14999; Group 2: $15000-$29999; Group 3: $30000-$47499; Group 4: >=$47500 
Macon Model 2006 Base Year Update 

13 Model Development Documentation 

Table 2.2.3-3 

Household Size/Income/Auto Ownership Distribution

(Augusta Household Travel Survey) 

Income 

Group 

Persons 

Per 

Household 

Autos Available 

0 1 2 3+

1 1 0.3063 0.6689 0.0248 0.0000

 2 0.0978 0.6578 0.2222 0.0222

 3 0.0733 0.6909 0.1628 0.0730

 4 0.1000 0.5694 0.1765 0.1541

2 1 0.2548 0.4776 0.2259 0.0417

 2 0.0400 0.2140 0.6320 0.1140

 3 0.1111 0.1256 0.6033 0.1600

 4 0.0900 0.1080 0.5942 0.2078

3 1 0.1833 0.6056 0.1578 0.0533

 2 0.0274 0.1677 0.6343 0.1707

 3 0.0900 0.1050 0.5033 0.3017

 4 0.0600 0.0438 0.3862 0.5100

4 1 0.0577 0.6654 0.2000 0.0769

 2 0.0694 0.1044 0.5322 0.2939

 3 0.0200 0.0581 0.5098 0.4121

 4 0.0189 0.0405 0.5405 0.4000

2.2.4 Trip Production 

The routine for computing trip productions uses cross-classified data from the household 

stratification model and applies trip rates to calculate Home Based Work, Home Based Other, 

Home Based Shopping, and Non Home Based Productions. Trip rates for each purpose are 

shown below. 
Macon Model 2006 Base Year Update 

14 Model Development Documentation 

Table 2.2.4-1 

MATS Trip Generation Trip Rates 

Home Based Work

 Household Size 

Autos Available 1 2 3 4+ 

0 0.285 0.750 1.556 1.000 

1 0.751 1.165 1.780 1.727 

2 0.733 1.305 1.625 2.109 

3+ 0.909 1.422 1.983 2.387 

Home Based Other

 Household Size 

Autos Available 1 2 3 4+ 

0 0.694 1.350 4.444 5.833 

1 1.190 1.835 4.195 6.523 

2 1.300 2.360 4.048 8.122 

3+ 1.818 2.688 3.600 7.312 

Home Based Shopping

 Household Size 

Autos Available 1 2 3 4+ 

0 0.367 0.558 0.222 0.417 

1 0.411 0.882 0.585 1.023 

2 0.200 0.675 0.490 0.769 

3+ 0.636 0.688 0.733 1.151 

Non Home Based

 Household Size 

Autos Available 1 2 3 4+ 

0 0.245 0.500 0.889 1.333 

1 1.081 1.518 2.976 2.886 

2 1.033 1.939 2.154 3.184 

3+ 1.364 2.016 2.667 3.720 

Trip end productions for other purposes are calculated using the following regression equations: 

I-I Truck Productions = 0.8404*Manufacturing Employment + 0.7971*Retail Employment + 

1.0197*Wholesale Employment + 0.3424*Service Employment + 0.2481*Households 

I-E Passenger Car Productions = 0.331*Households + 0.724*Total Employment 

I-E Truck Productions = 0.078*Retail Employment + 2.149*Wholesale Employment + 0.228*Manufacturing 

Employment 

2.2.5 Trip Attraction Sub-model 

The trip attraction routine to compute the estimated number of trips attracted to each TAZ uses 

the following regression equations: 

Home Based Work Attractions = 1.196*Total Employment 

Home Based Other Attractions = 0.5077*Population + 0.967*Total Employment + 1.5258*School 

Enrollment 

Home Based Shopping Attractions = 2.655*Retail Employment 

Non-Home Based Attractions = 0.293(Population) + 2.82108*(Retail Employment + Wholesale 

Employment) + 0.6984*Service Employment 

Internal Truck Attractions = Internal Truck Productions 
Macon Model 2006 Base Year Update 

15 Model Development Documentation 

Internal-External Attractions = Based on counts and EE% (internal zones=0) 

Internal-External Truck Attractions = Based on counts, EE%, and Truck% (internal zones=0) 

The total number of Internal-External (I-E) trips for each external station is calculated by 

subtracting the estimated number of External-External trips (based on an assumed percentage) 

from the station’s daily traffic volume. Then the total I-E trips are separated into I-E truck trips 

and other I-E trips based on an assumed truck percentage at each external station. The following 

table displays the percentages that are used to calculate I-E and E-E Attractions at each external 

station for truck and passenger cars. For example, 60% of the daily traffic at station number 414 

– I-75S is I-E while 40% is E-E. 

Table 2.2.5-1 

MATS Proportion of External-Internal Trips by External Station 

 Trucks PC's 

2006 

Station 

2002 

Station 2006 Percent Percent Percent Percent Percent Percent 

Number Number Road Name Volume Trucks PC's E-E I-E E-E I-E

414 404 I-75/SR 401 (South) 77,186 30.0 70.0 20.0 10.0 20.0 50.0 

415 405 Hartley Bridge/CR 716 3,930 5.0 95.0 0.0 5.0 0.0 95.0 

416 406 Knoxville/CR 715 3,420 5.0 95.0 0.0 5.0 0.0 95.0 

417 407 US 80/SR 22 (West) 5,240 5.0 95.0 3.0 2.0 0.0 95.0 

418 408 Hopewell/CR 721 1060 5.0 95.0 0.0 5.0 0.0 95.0 

419 409 Lower Thomaston 480 5.0 95.0 0.0 5.0 0.0 95.0 

420 410 SR 74 2,730 11.0 89.0 1.0 10.0 4.0 85.0 

421 411 Zebulon/CR 726 2,470 5.0 95.0 1.0 4.0 5.0 90.0 

422 412 I-475/SR 408 59,630 25.0 75.0 20.0 5.0 25.0 50.0 

423 413 US 41/SR 19 (North) 4,270 10.0 90.0 2.0 8.0 5.0 85.0 

424 414 I-75/SR 401(North) 34,390 25.0 75.0 15.0 10.0 15.0 60.0 

425 415 New Forsyth/CR 732 1,860 10.0 90.0 1.0 9.0 5.0 85.0 

426 416 SR 87 8,510 10.0 90.0 2.0 8.0 5.0 85.0 

427 417 Upper River Rd./SR 11 1610 5.0 95.0 0.0 5.0 0.0 95.0 

428 418 Gray Hwy./US 129 18,120 10.0 90.0 2.0 8.0 5.0 85.0 

429 419 SR 290 2,720 5.0 95.0 0.0 5.0 3.0 92.0 

430 420 SR 49 8,130 10.0 90.0 2.0 8.0 3.0 87.0 

431 421 Henderson Rd. 1,770 5.0 95.0 0.0 5.0 5.0 90.0 

432 422 SR 57 5,990 10.0 90.0 1.0 9.0 3.0 87.0 

433 423 Davis Road 850 5.0 95.0 0.0 5.0 0.0 95.0 

434 424 US 80 (East) 2,070 10.0 90.0 1.0 9.0 3.0 87.0 

435 425 Mill Road 620 5.0 95.0 0.0 5.0 0.0 95.0 

436 426 I-16/SR 404 22,380 15.0 85.0 10.0 5.0 25.0 60.0 

437 427 US 23/SR 87 3,220 10.0 90.0 1.0 9.0 3.0 87.0 

438 428 US129 / SR247 25,210 10.0 90.0 1.0 9.0 3.0 87.0 

439 429 US 41 (South) 7,850 10.0 90.0 1.0 9.0 3.0 87.0 

440 430 Houston Rd. 6,340 5.0 95.0 1.0 4.0 2.0 93.0
Macon Model 2006 Base Year Update 

16 Model Development Documentation 

2.2.6 External-External Trips 

Two external-external (E-E) trip tables were estimated for the 2006 calibration. One for 

passenger cars and one for trucks. The external-external trip tables were developed based on the 

2002 E-E trip patterns. A matrix summarizing the distance in miles between all external stations 

was developed using the 2006 network with illogical movements eliminated. This distance 

matrix serves as a “seed” to develop the E-E trip tables. The theory behind using distance 

between external stations to help predict external-external trips is that the greater the distance 

between external stations, the more likely there will be external-external trips between these 

external stations. For example, typically, the distance between two external stations on either end 

of an interstate facility would be longer and, likewise, the number of trips that will travel 

between the two external stations on either end of the interstate would be higher. The final 2006 

external trip tables were estimated by applying the FRATAR procedure on the distance matrix to 

match the estimated E-E trips at each external station. Because E-E traffic volumes on collectors 

and local streets are relatively low, it is assumed these movements were negligible. 

2.2.7 Special Generators 

Special generators are used for zones or activity centers having trip rates that are not represented 

well by the standard trip generation process. During the MATS travel model calibration process, 

one area was identified where assigned trips were not matching observed traffic counts 

reasonably well. The location was in the vicinity of Arkwright Road/Tom Hill Sr. Blvd. and I-75. 

The I-E passenger car production trip ends were multiplied by a factor of 5 for zones 299, 368 

and 369 in the Arkwright Road/Tom Hill Sr. Blvd. area around I-75 to make I-E trips more 

attractive. 

2.2.8 Balancing Productions and Attractions 

A TP+ script was developed for the trip generation process. Using 2006 socioeconomic data, the 

script calculates and balances the productions and attractions, writes the productions and 

attractions to a file, builds the E-E trip table, calculates Fratar factors, and applies the Fratar 

model to adjust the E-E table so that traffic volumes at external stations closely match traffic 

counts. The calculated productions and attractions for 2006 by zone are in Appendix B.

For most trip purposes in the MATS model, production and attraction trip ends are computed 

separately. As such, the sum of productions across all zones does not necessarily equal the sum 

of attractions. In reality though, each trip has two trip ends; one is a production/origin and one is

an attraction/destination. In theory, it makes sense to equalize the sum of productions with the 

attractions across all zones which, in effect, “balances” the two types of trip ends. This 

balancing or reconciliation is performed in the trip generation script. The script uses the process 

listed below. 
Macon Model 2006 Base Year Update 

17 Model Development Documentation 

Balancing Productions and Attractions 

1. Productions and Attractions are calculated for all internal TAZs by purpose. 

2. Zonal attractions for each trip purpose are proportionally adjusted so the total attractions 

equal the total productions by purpose (i.e. attractions balanced to productions) for all 

internal zones. 

3. Special generator productions and attractions are added/subtracted. 

4. Non-home based productions are set equal to non-home based attractions (NHB trip 

productions were generated in the “home” zone, but by definition, NHB trips do not 

begin or end at the home. Therefore, the assumption is that the attraction variables are a 

better indicator of total trips than home based characteristics). 

5. Attractions are balanced to productions for all internal zones (except NHB). 

6. Internal-External Attractions (including trucks) are calculated for external stations. 

7. I-E productions (including trucks) are balanced to the calculated attractions (assumes that 

since I-E attractions are based on traffic counts or external station projections, they 

provide the best controls). 

8. The I-E productions and attractions are appended to the I-I trip end file to produce the 

final productions and attractions. 

2.3 Trip Distribution 

Trips are calculated for persons, by trip purpose, from the production and attraction trip ends. 

The trip distribution step uses the gravity model process, which is commonly used for this 

purpose in urban models. The estimated number of trips between any two origin-destination 

zones will, in general, be proportional to the number of trip ends (mass) and inversely 

proportional to the travel time. The gravity model computes trips such that the resulting 

distribution matches an observed distribution of trips by travel time for each of the trip purposes. 

Minimum time paths for the network were calculated using the TP+ Hwyload function. These 

times include all turn prohibitory and turn penalties. The minimum times were then adjusted to 

include the intrazonal times, terminal times, and topographical penalties. Intrazonal times, the 

average time it takes to make a trip inside a particular TAZ, were created by the TP+ Matrix 

function using travel time to the nearest four TAZ’s. Terminal times were assigned based on the 

employment density of the origin and destination TAZ’s. At the trip origin, terminal time 

generally refers to the walk from one’s residence to their car. At the destination end, it generally 

represents the time it takes to go from one’s car to their destination. The following table 

summarizes the terminal time criteria: 

Table 2.3-1 

MATS Terminal Time Criteria 

Zone 

Employment Density 

(Total Employees per Acre)

0-1.00 1.01-15.00 15.01-25.00 25.01-50.00 50.01-75.00 >75.00 

Origin 1 minute 1 minute 2 minutes 2 minutes 2 minutes 2 minutes 

Destination 1 minute 2 minutes 3 minutes 5 minutes 6 minutes 7 minutes 
Macon Model 2006 Base Year Update 

18 Model Development Documentation 

Topographic penalties were added during the model calibration process. These penalties were 

added to improve the estimated travel patterns between large sections of the model. They take 

the form of a time handicap that is added to specific inter-zonal times. It tends to reduce the 

number of trips calculated during the trip distribution process for those origin-destination pairs 

where they are applied. In Macon, time handicaps were applied to interzonal times for origindestination pairs located on opposite sides of the Ocmulgee River, for trips with an origindestination in Downtown/Intown Macon, and South Bibb. The latter reflects the proximity of 

Warner Robins and Robins Air Force Base. 

Average trip travel times are displayed in the following table. These are typical trip travel times, 

found in urban areas the size of Macon. Home Based Work trips have the longest trip travel time 

at 21.8 minutes while Non Home Based trips have the shortest travel time at 16.4 minutes. The 

comparison of the model results with the target values is shown in Appendix C.

Table 2.3-2 

MATS Average Trip Travel Times 

Trip Purpose

Average Trip 

Travel Time 

(Time)

Home Based Work 21.8 

Home Based Other 16.8 

Home Based Shopping 16.3 

Non Home Based 16.4 

Trucks 19.1 
Macon Model 2006 Base Year Update 

19 Technical Report 

Gravity model input consists of a set of travel time impedance factors (friction factors), in 

addition to the production trip ends, attraction trip ends and minimum time skim. These 

parameters force the gravity model to produce sets of trips by trip purpose, whose distributions 

approximate an observed travel time distribution. 

2.4 Mode Split 

The mode split process determines what mode of travel will be used to make the trips between 

zones. A trip-end model was used to determine the number of transit trips. Trip-end models are 

based on socio-economic characteristics within traffic zones (i.e., income, auto-ownership, etc.), 

rather than service characteristics between zones. Trip-end models can serve as a reasonable tool 

for estimating changes in regional transit ridership levels in response to changes in regional 

transit investments and policies. 

Since trip-end models are based on zonal attributes, the implied assumption is that transit 

ridership consists primarily of “captive” riders who must use transit, and a fixed share of those 

who choose to use transit over other available modes. A trip-end modeling approach has been 

developed that can be used to test the effectiveness of system-wide transit improvements. The 

general approach is as follows: 

1. Transit trip rates are calibrated to replicate base year transit ridership totals. Transit trip 

rates are stratified by auto ownership level (0 autos; 1 auto; 2 autos; 3+ autos)4

. 

2. Each Traffic Analysis Zone (TAZ) is coded with attributes that designate whether a zone 

is within three transit service area buffers (0.25-mile, 0.5-mile and 1-mile). 

3. Transit service area attributes are used to estimate the percentage of households in each 

zone that have access to transit. 

4. Transit trips are estimated by applying transit trip rates to households that are within the 

transit service area. 

5. Highway person trip tables are estimated by subtracting transit trips from the total person 

trip tables estimated in the trip generation model.

Future regional-level transit policies can be tested, including transit service area expansion, fare 

adjustments and headway5 changes. Trip rates can also be factored to test the effects of attracting 

more choice riders. Base year operating costs and revenues are used to estimate the costs of the 

regional transit policies. 

After the transit trips are calculated and subtracted, the remaining person trips are converted to 

vehicle trips for the internal trip purposes (HBW, HBO, HBS and NHB). Average auto 

occupancy rates by purpose from various sources such as the Census Journey-to-Work data and 

other national travel surveys were used to estimate the Macon average auto occupancy rate. The 

other trip tables, internal truck and I-E and E-E passenger car and truck trips were calculated in 

 

4 Initial trip rates were calculated from the 1997 Augusta Household Travel Survey, and are scaled proportionally to produce observed trip totals. 

5 Using typical fare and headway elasticities.
Macon Model 2006 Base Year Update 

20 Technical Report 

terms of vehicle trips at their inception. Conversion to vehicle trip table enables comparison to 

vehicle counts and capacity analyses. 

The following trip table factors or vehicle occupancy rates were used in the MATS model: 

Table 2.4-1 

MATS Vehicle Occupancy Rates 

Trip Purpose Occupancy Rate 

Home Based Work 1.12 

Home Based Other 1.65 

Home Based Shopping 1.48 

Non Home Based 1.68 

Internal Trucks No adjustment – already vehicle trips 

Internal-External No adjustment – already vehicle trips 

Internal-External Trucks No adjustment – already vehicle trips 

2.5 Traffic Assignment 

The last step in the modeling sequence is the assignment or simulation of the trip tables to logical 

routes in the highway network. Trip assignment for the MATS model was accomplished using 

the equilibrium assignment technique. The traffic assignment algorithm is iterative, running 

through successive applications until equilibrium occurs. Equilibrium occurs when no trip can 

be made by an alternate path without increasing the total travel time of all trips in the network. 

The equilibrium assignment is an iterative process that reflects travel demand assigned to 

minimum time paths as well as the effects of congestion. In each iteration, traffic volumes are 

loaded onto network links and travel times are adjusted in response to the volume to capacity 

relationships. Final assigned volumes are derived by summing a percentage of the loadings from 

each iteration. The percentages reflect congested conditions that usually influence motorists' 

path selection for a portion of the day, not the entire day. 

During the model run, additional network link attributes are attached to the input network to 

store assignment results as well as values used in the traffic assignment. These additional 

attributes provide volumes, travel time, speed, and so on for each link, and can be used to 

summarize network-wide link statistics. A list of these attributes is shown in Table 2.5-1. 

Table 2.5-1 

MATS Travel Demand Model – Output Network Attributes 

Attribute Name Description 

Taz Nearest Taz ID 

Atype Area Type 

Hcap Hourly Capacity 

Capacity Daily Capacity 
Macon Model 2006 Base Year Update 

21 Technical Report 

MATS Travel Demand Model – Output Network Attributes 

Attribute Name Description 

Speed Freeflow Speed in Mile per Hour 

Time_ff Free Flow Travel Time 

Time_op Off-peak Travel Time 

Linkclass Linkclassification Used in Assignment 

V_1 Daily Volume (One-way) 

Vc_1 Daily Volume over Capacity Ratio 

Cspd_1 Congested Speed in Mile per Hour 

Vht_1 Vehicle Hour of Travel 

Vt_1 Daily Volume (Two-way) 

Count Base Year Traffic Count (One-way) 

V_hbw Daily Volume (Home Based Work) 

V_hbo Daily Volume (Home Based Other) 

V_hbs Daily Volume (Home Based Shopping) 

V_trk Daily Volume (Truck) 

V_ie Daily Volume (Internal-external Passenger Cars) 

V_ietrk Daily Volume (Internal-external Trucks) 

V_eepc Daily Volume (External-external Passenger Cars) 

V_eetrk Daily Volume (External-external Trucks) 

V_Totalpc Daily Volume (Total Passenger Cars) 

V_tottrk Daily Volume (Total Trucks) 

Vmt_1 Total Daily Vehicle Mile of Travel 

Vcnt Daily Volume over Base Year Count Ratio 

2.5.1 Model Calibration 

Georgia DOT requires refinements to various model parameters until the base year (2006) model 

sufficiently replicates observed 2006-level travel patterns. The base year model was checked for 

accuracy by determining the percent error of assigned volumes compared to ground counts and 

by checking the reasonableness of the model’s Vehicle-Miles Traveled (VMT) statistics. Also, 

the model was tested along screenlines to indicate if there were any broad areas where trips 

appeared to be consistently overestimated or underestimated. Results from each of these tests 

are presented in the following tables and figures. 

Georgia DOT requires multiple validation checks to each of the major steps in the travel demand 

modeling process. Output modeled volumes are validated against traffic counts at several levels 

– regional, corridors (screenlines & cutlines) and link-by-link. Regional evaluations include 

VMT, Root Mean Squared Error (RMSE) and R-Squared calculations. Corridor evaluations are 

primarily screenline and cutline comparisons. Nationally recognized maximum desirable 

deviation standards are applied to analyze model performance at the link level. These include 
Macon Model 2006 Base Year Update 

22 Technical Report 

FHWA’s “Calibration & Adjustment of System Planning Models”, 1990 and the NCHRP Report 

365: “Travel Estimation Techniques for Urban Planning”, 1998. 

One of many steps in the validation process involves screenlines. Screenlines are defined by 

features such as railroads, creeks, and rivers. Since all roadways are not reflected in the travel 

demand model, these types of features serve to funnel traffic into corridors so that all trips can be 

analyzed where crossing of these features is possible. Cutlines are imaginary lines drawn 

perpendicular to roadways to assist with analyzing traffic flow between geographic areas, such as 

north to south, east to west, etc. Figure 2.5.1-1 depicts the locations of screenlines and cutlines 

used during the validation process. Where each screenline or cutline crosses a roadway can be 

identified by following the color coded links across the MATS area. 

Figure 2.5.1-1 

MATS Screenline Locations 
Macon Model 2006 Base Year Update 

23 Technical Report 

Table 2.5.1-1 lists the results of the screenline/cutline analysis. All of the model volumes for the 

screenlines are well within the acceptable range of error when compared to the observed traffic 

volumes. 

Table 2.5.1-1 

MATS Summary of the Screenlines – Delta Matrix 

Screenlines 

Target 

Range / Value 

MATS 2006 

Model 

All Counts +/- 9% 1 % 

East of I-16 +/- 23 % 1 % 

West of I-16 +/- 22 % 3 % 

North of Macon +/- 17 % 3 % 

West of Macon +/- 36 % 3 % 

Central Macon +/- 19 % 0 % 

Far South of Macon +/- 23 % -1 % 

South of Macon +/- 20 % 1 % 

Far North of Macon +/- 21 % -1 % 

East of I-75 +/- 26 % 0 % 

South of Downtown +/- 23 % -3 % 

Table 2.5.1-2 lists the results of the comparison between the MATS model assigned volumes and the 

observed volumes for each link within each screenline. In most cases, the largest differences between the 

model and observed counts occur on the less traveled facilities. 

Table 2.5.1-2 

MATS 2006 Screenline/Cutline Results 

Screenline 1: East of I-16 

 2006 2006 Volume Percent Maximum

 Assign Observed /Count Deviation Desirable

Road Name Volume Count Ratio

From 

Base Deviation

Jeffersonville 10,040 11,140 0.9 -9.87% 36.50%

SR 11/Gray Hwy 23,320 21,470 1.09 8.62% 27.42%

Emery Hwy. 17,880 16,400 1.09 9.02% 30.84%

I-16 22,780 22,525 1.01 1.13% 26.85%

I-16 21,620 22,525 0.96 -4.02% 26.85%

SR 49/Shurling 23,060 23,780 0.97 -3.03% 26.22%

Total 118,700 117,840 1.01 0.73% 23.30%
Macon Model 2006 Base Year Update 

24 Technical Report 

Screenline 2: West of I-16 

 2006 2006 Volume Percent Maximum

 Assign Observed /Count Deviation Desirable

Road Name Volume Count Ratio From Base Deviation

I-16 41,750 39,635 1.05 5.34% 20.99%

I-16 42,610 39,635 1.08 7.51% 20.99%

Second 12,840 10,660 1.20 20.45% 37.21%

M.L.King 20,220 19,720 1.03 2.54% 28.46%

Spring 20,600 23,870 0.86 -13.70% 26.18%

Total 138,020 133,520 1.03 3.37% 22.22%

Screenline 3: North of Macon 

 2006 2006 Volume Percent Maximum

 Assign Observed /Count Deviation Desirable

Road Name Volume Count Ratio From Base Deviation

Upper River Rd 2,460 2,000 1.23 23.00% 77.19%

SR 11/Gray Hwy 23,320 21,470 1.09 8.62% 27.42%

New Clinton 3,980 3,230 1.23 23.22% 62.63%

Henderson Rd. 1250 1,450 0.86 -13.79% 88.82%

I-475 32,420 30,505 1.06 6.28% 23.53%

I-475 31,220 30,505 1.02 2.34% 23.53%

Milledgeville Rd 15,480 15,850 0.98 -2.33% 31.30%

I-75 31,220 29,430 1.06 6.08% 23.90%

I-75 29,980 29,430 1.02 1.87% 23.90%

North Lizella Rd 3,050 2,800 1.09 8.93% 66.66%

Forest Hill 8,910 8,020 1.11 11.10% 42.13%

Heath 6,850 7,640 0.90 -10.34% 43.03%

SR 19/US 41 23,600 23,890 0.99 -1.21% 26.17%

Riverside 23,310 25,160 0.93 -7.35% 25.59%

SR 74 18,190 19,190 0.95 -5.21% 28.80%

Wimbish 8,310 8,200 1.01 1.34% 41.72%

Mumford 3,580 1,300 2.75 175.38% 93.15%

Total 267,130 260,070 1.03 2.71% 17.23%

Screenline 4: West of Macon 

 2006 2006 Volume Percent Maximum

 Assign Observed /Count Deviation Desirable

Road Name Volume Count Ratio From Base Deviation

Mt. Pleasant 6,320 7,300 0.87 -13.42% 43.89%

Hartley Bridge 5,410 4,000 1.35 35.25% 57.06%

Columbus Rd 6,050 5,510 1.10 9.80% 49.62%

Thomaston 2,880 2,820 1.02 2.13% 66.45%

SR 74 3,440 3,500 0.98 -1.71% 60.48%

Fulton Mill Rd 5,290 5,380 0.98 -1.67% 50.14%

SR 22/US 80 8,920 8,380 1.06 6.44% 41.33%

Sardis Church 1,860 1,930 0.96 -3.63% 78.40%

Total 40,170 38,820 1.03 3.48% 35.58%
Macon Model 2006 Base Year Update 

25 Technical Report 

Screenline 5: Central Macon 

 2006 2006 Volume Percent Maximum

 Assign Observed /Count Deviation Desirable

Road Name Volume Count Ratio From Base Deviation

Sardis Church 4,300 2,080 2.07 106.73% 75.89%

Tucker 9,660 9,810 0.98 -1.53% 38.58%

I-75 16,490 17,470 0.94 -5.61% 30.00%

Rocky Creek Rd 23,270 21,450 1.08 8.48% 27.43%

Hartley 12,520 11,000 1.14 13.82% 36.70%

Log Cabin 12,400 12,140 1.02 2.14% 35.16%

SR 74 35,450 34,940 1.01 1.46% 22.17%

US 80/SR 22 28,970 29,860 0.97 -2.98% 23.75%

I-75 16,100 17,470 0.92 -7.84% 30.00%

Williamson Rd 8,110 8,950 0.91 -9.39% 40.16%

SR 19/US41 3,300 3,600 0.92 -8.33% 59.74%

Zebulon 25,960 27,130 0.96 -4.31% 24.76%

Total 196,530 195,900 1.00 0.32% 19.20%

Screenline 6: Far South of Macon 

 2006 2006 Volume Percent Maximum

 Assign Observed /Count Deviation Desirable

Road Name Volume Count Ratio From Base Deviation

I-75 38,570 39,175 0.98 -1.54% 21.09%

I-75 38,600 39,175 0.99 -1.47% 21.09%

US129 / SR247 29,630 28,890 1.03 2.56% 24.09%

Houston Rd 9,370 10,100 0.93 -7.23% 38.10%

Knoxville 3,420 3,420 1.00 0.00% 61.09%

Fulton Mill 2,580 2,600 0.99 -0.77% 68.85%

Total 122,170 123,360 0.99 -0.96% 22.90%

Screenline 7: South of Macon 

 2006 2006 Volume Percent Maximum

 Assign Observed /Count Deviation Desirable

Road Name Volume Count Ratio From Base Deviation

Riggins Mill 2,580 2,950 0.87 -12.54% 65.16%

I-475 28,920 28,145 1.03 2.75% 24.37%

I-75 16,490 17,470 0.94 -5.61% 30.00%

I-16 11,180 11,185 1.00 -0.04% 36.44%

I-16 11,190 11,185 1.00 0.04% 36.44%

Jeffersonville 2,190 2,090 1.05 4.78% 75.73%

SR 87/US 129 5,640 4,200 1.34 34.29% 55.86%

Mead Rd 5,140 3,490 1.47 47.28% 60.55%

SR247 43,000 43,000 1.00 0.00% 20.25%

I-75 16,100 17,470 0.92 -7.84% 30.00%

I-475 28,420 28,145 1.01 0.98% 24.37%

Knoxville 3,040 3,270 0.93 -7.03% 62.30%

Fulton 3,690 3,960 0.93 -6.82% 57.31%

Total 177,580 176,560 1.01 0.58% 19.98%
Macon Model 2006 Base Year Update 

26 Technical Report 

Screenline 8: Far North of Macon 

 2006 2006 Volume Percent Maximum

 Assign Observed /Count Deviation Desirable

Road Name Volume Count Ratio From Base Deviation

Gray Hwy. (US129) 17,770 18,120 0.98 -1.93% 29.52%

Lite-N-Tie Rd. 2,720 2,720 1.00 0.00% 67.51%

Arkwright 1620 1,630 0.99 -0.61% 84.40%

SR 87 12,350 12,580 0.98 -1.83% 34.62%

Forest Hill 2,630 2,400 1.10 9.58% 71.29%

I-75 20,300 20,335 1.00 -0.17% 28.08%

I-475 29,820 29,815 1.00 0.02% 23.76%

Upper River Rd 1,380 1,610 0.86 -14.29% 84.85%

I-75 20,730 20,335 1.02 1.94% 28.08%

Bass Rd 10,680 11,320 0.94 -5.65% 36.25%

I-475 29,800 29,815 1.00 -0.05% 23.76%

Total 149,800 150,680 0.99 -0.58% 21.22%

Screenline 9: East of I-75 

 2006 2006 Volume Percent Maximum

 Assign Observed /Count Deviation Desirable

Road Name Volume Count Ratio From Base Deviation

Hardeman Ave 12,700 16,500 0.77 -23.03% 30.76%

US 80 13,840 15,410 0.90 -10.19% 31.69%

man 6,510 7,000 0.93 -7.00% 44.70%

Little 17,790 14,510 1.23 22.61% 32.53%

Anthony 6,570 4,500 1.46 46.00% 54.20%

Newberg 4,340 4,500 0.96 -3.56% 54.20%

Rocky Creek 8,330 5,500 1.51 51.45% 49.66%

Hightower 2,220 2,300 0.97 -3.48% 72.63%

Forsyth 11,910 14,160 0.84 -15.89% 32.88%

Total 84,210 84,380 1.00 -0.20% 26.47%

Screenline 10: South of Downtown 

 2006 2006 Volume Percent Maximum

 Assign Observed /Count Deviation Desirable

Road Name Volume Count Ratio From Base Deviation

Fifth St 5,030 2,650 1.90 89.81% 68.28%

College St 5,990 7,000 0.86 -14.43% 44.70%

First St 7,410 7,940 0.93 -6.68% 42.31%

I-75 39,750 42,045 0.95 -5.46% 20.45%

Second 6,350 6,540 0.97 -2.91% 46.05%

I-75 40,050 42,045 0.95 -4.74% 20.45%

SR 247 20,170 21,000 0.96 -3.95% 27.69%

Total 124,750 129,220 0.97 -3.46% 22.50%
Macon Model 2006 Base Year Update 

27 Technical Report 

Another way of viewing link validation is through the use of a scatter plot that depicts the 

relationship between traffic counts and modeled volumes. The following graphic depicts this 

relationship for the MATS 2006 network. The graphic indicates that the majority of modeled 

volumes are consistent with the traffic counts. It should be noted that it is normal to have 

outliers, both high and low. The R2 value of 0.9483 indicates the model successfully replicates 

base year travel characteristics. 

Figure 2.5.1-2 

 Collector and local streets were not included in the model deviation validation analysis. 

 

The modeled traffic volumes summarized by facility type are shown in Table 2.5.1-3. The 

HPMS VMT is based on the Georgia Department of Transportation’s Office of Transportation 

Data “445” report as well as on the 2006 RC database. The HPMS VMT numbers represent the 

average annual daily VMT for the year 2006 for all of Bibb County and a third of Jones County. 

The HPMS VMT for Jones County was prorated based on roadway mileage. 

The highway network and trip table are considered to provide a good representation of travel 

conditions on the existing system if the total percent error region-wide is less than +/-5 percent. 

For the MATS model, the total percent error region-wide is less than 1.0% excluding the local 

streets. Calculating the percent error by facility type indicates whether the model is loading trips 

in a reasonable manner. The MATS model is performing very well estimating traffic volumes 

for all of the facility types except for local roads. This is not surprising or alarming since most of 

MATS 2006 Travel Demand Model Scatter Plot

R

2

 = 0.9855

0

10000

20000

30000

40000

50000

0 10000 20000 30000 40000 50000

Count

Modeled Volume
Macon Model 2006 Base Year Update 

28 Technical Report 

the local roads in an urban area are usually not included in a regional travel demand model. 

These volumes are provided below just for informational purposes only. 

Table 2.5.1-3 

MATS Model Area VMT Statistics 

 VMT Between Model and HPMS

Facility Type Model HPMS Difference Percent

Interstate 2,316,953 2,381,608 -64,655 -3%

Principal Arterials 968,211 966,347 1,864 0%

Minor Arterials 1,297,517 1,242,472 55,045 4%

Collectors 511,537 493,135 18,402 4%

Total excluding Local Roads 5,094,218 5,083,561 10,657 0%

Local 792,897 389,723 403,174 51%

Total including Local Roads 5,887,115 5,473,285 413,830 7%

Comparing the deviation of assigned link volumes with the maximum desirable deviation is also 

a method for validation and calibration check. The higher the link traffic count, the smaller the 

maximum desired deviation allowed on that link. Generally, models should be able to replicate 

traffic volumes on higher facilities more accurately than those on lower facilities. Higher 

facilities have higher usage and often are focuses of transportation policy making. Therefore, 

how well the model assigns trips on these facilities is another indicator for how well the model is 

validated and calibrated and how useful the model would be. Figure 2.5.1-3 shows the 

comparison of the maximum desired deviation curve and the model assigned volumes. Figure 

2.5.1-4 illustrates trip-loaded network. The model performed very well system-wide with almost 

all major facilities within the maximum desired deviation allowed. 
Macon Model 2006 Base Year Update 

29 Technical Report 

Figure 2.5.1-3 

Figure 2.5.1-4 

MATS 2006 Travel Demand Model

-2

-1.5

-1

-0.5

0

0.5

1

1.5

2

0 10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000

Traffic Count (Directional)

Percent Deviation (Model Volume -vs- Directional Count)

Percent Difference from Counts Maximum Desirable Deviation "Maximum Desirable Deviation Neg"

Exceed Maximum Desired Deviation 

(Over Assignment)

Within Maximum Desired Deviation

Exceed Maximum Desired Deviation 

(Under Assignment)

Exceed Maximum Desired Deviation 

(Over Assignment)

Within Maximum Desired Deviation

Exceed Maximum Desired Deviation 

(Under Assignment)
Macon Model 2006 Base Year Update 

30 Technical Report 

2.5.2 Delta Matrix Process 

Due to the many variables involved, estimated traffic volumes from travel demand models will 

inevitably differ from observed traffic counts. As a result, it is usually necessary to post-process 

modeled volumes for use in traffic studies. National Cooperative Highway Research Program 

(NCHRP) Report 255 outlines a widely used methodology for post-processing model results, but 

like many approaches to refining travel demand models, the procedures are intended for specific 

projects or corridors and are not easily applied to an entire region. 

Matrix estimation techniques to post-process travel demand model volumes for an entire region 

have been developed for the GDOT MPO areas. This region level post-processing is done by 

developing a delta matrix, which is a trip table that is combined with the normal travel demand 

model trip table to produce traffic assignments that closely replicate observed traffic counts. 

Figure 2.5.2-1 outlines how a delta matrix is developed. The delta matrix process uses the travel 

demand model trip table as a seed for a matrix estimation process. The matrix estimation process 

attempts to closely replicate observed traffic counts, while also controlling the trip ends and trip 

lengths implied in the seed matrix. This is accomplished by iteratively assigning a trip table, 

adjusting the trip table to match traffic counts, then applying a tri-proportional fitting process to 

match trip ends and trip lengths. Once a trip table is produced that sufficiently matches the traffic 

counts, a delta matrix is produced by subtracting the initial seed trip table from the estimated trip 

table. 

Figure 2.5.2-1 – Delta Matrix Process 
Macon Model 2006 Base Year Update 

31 Technical Report 

Conceptually the resulting delta matrix represents the localized factors that the regional travel 

demand modeling process does not reproduce well. Future travel demands are post-processed by 

applying the same local corrections that are represented in the delta matrix without adjustment 

since similar localized issues cannot be identified for future conditions. Therefore, the delta 

matrix is simply added to future trip tables before assigning the trips. 
Macon Model 2006 Base Year Update 

32 Technical Report 

Appendix A: Socio-Economic Variables By Zone for 2006 

Traffic Employment 

Zone Households Pop School Retail Service Manuf Whole Total Emp 

1 0 0 0 9 210 0 6 225 

2 0 0 0 6 179 0 0 185 

3 0 0 0 0 109 0 2 111 

4 0 0 0 19 34 0 0 53 

5 0 0 0 16 133 0 0 149 

6 4 50 0 0 135 0 0 135 

7 0 0 0 3 126 0 2 131 

8 0 0 0 33 73 0 0 106 

9 0 0 0 19 103 4 2 128 

10 0 0 0 18 50 13 0 81 

11 0 0 0 35 27 4 0 66 

12 0 0 0 13 668 4 0 685 

13 0 0 0 16 52 0 0 68 

14 4 14 0 56 188 0 0 244 

15 0 0 0 0 565 0 0 565 

16 0 0 0 0 199 0 0 199 

17 0 0 0 0 0 0 0 0 

18 0 0 0 9 7 0 31 47 

19 0 0 0 31 19 9 307 366 

20 39 39 0 29 126 19 0 174 

21 208 208 0 138 1032 0 2 1172 

22 0 0 0 13 608 0 28 649 

23 0 0 0 13 197 0 15 225 

24 0 0 0 13 98 0 0 111 

25 0 0 0 12 295 0 0 307 

26 0 0 0 54 52 0 0 106 

27 0 0 0 63 806 0 8 877 

28 15 19 0 5 188 0 0 193 

29 0 0 0 3 119 4 0 126 

30 0 0 0 0 3 0 0 3 

31 0 0 0 0 0 8 11 19 

32 0 0 0 18 179 0 0 197 

33 0 0 0 3 18 9 0 30 

34 0 0 0 3 247 4 28 282 

35 0 0 0 0 42 19 0 61 

36 0 0 0 6 228 0 0 234 

37 0 0 0 19 0 0 0 19 

38 15 29 0 0 150 9 6 165 

39 0 0 0 0 33 9 0 42 

40 0 0 0 45 47 0 0 92 

41 0 0 0 0 238 9 0 247 

42 0 0 0 0 0 0 0 0 

43 0 0 0 0 1,207 0 0 1207 

44 0 0 0 3 4,228 0 2 4233 

45 69 341 0 5 216 0 0 221 

46 0 0 0 0 662 0 0 662 
Macon Model 2006 Base Year Update 

33 Technical Report 

Traffic Employment 

Zone Households Pop School Retail Service Manuf Whole Total Emp 

47 113 469 0 0 8 0 0 8 

48 0 0 0 0 3 0 2 5 

49 10 10 0 80 167 0 0 247 

50 182 510 0 5 110 0 0 115 

51 34 75 0 0 92 0 12 104 

52 74 166 0 22 0 0 0 22 

53 99 257 0 5 35 0 0 40 

54 129 297 421 0 102 0 0 523 

55 74 152 0 3 3 0 0 6 

56 73 173 0 0 16 0 0 16 

57 204 478 0 3 34 0 0 37 

58 10 19 0 5 31 0 0 36 

59 380 1099 1183 3 162 0 0 1348 

60 98 245 0 125 42 0 0 167 

61 166 344 0 57 43 0 0 100 

62 245 593 0 608 462 19 0 1089 

63 20 73 0 28 31 0 12 71 

64 262 658 0 178 107 4 0 289 

65 306 1004 20 6 260 0 0 286 

66 225 563 0 0 15 0 0 15 

67 661 1825 410 31 204 0 28 673 

68 117 314 0 3 212 0 0 215 

69 246 657 0 15 93 0 0 108 

70 432 1156 0 0 19 0 0 19 

71 289 696 0 3 26 54 2 85 

72 264 457 0 213 463 9 6 691 

73 196 367 0 0 0 0 0 0 

74 127 425 0 5 99 0 0 104 

75 84 157 0 0 0 0 0 0 

76 59 132 0 0 0 0 0 0 

77 178 422 0 0 51 0 0 51 

78 196 315 909 6 224 0 0 1139 

79 143 212 0 0 10 0 0 10 

80 9 37 0 6 7 0 0 13 

81 69 161 0 0 10 0 0 10 

82 197 203 0 155 197 0 24 376 

83 339 627 0 78 389 0 2 469 

84 542 1129 0 0 54 96 0 150 

85 0 0 0 0 0 0 0 0 

86 109 258 0 0 8 0 1 9 

87 30 80 0 25 17 0 1 43 

88 57 137 0 0 0 0 0 0 

89 514 1460 0 0 31 0 0 31 

90 13 37 0 0 152 0 0 152 

91 191 504 0 0 13 0 7 20 

92 85 170 0 18 27 0 3 48 

93 13 26 0 0 4 0 0 4 

94 100 338 0 0 24 3 0 27 
Macon Model 2006 Base Year Update 

34 Technical Report 

Traffic Employment 

Zone Households Pop School Retail Service Manuf Whole Total Emp 

95 58 204 0 0 13 0 0 13 

96 133 342 0 0 8 0 0 8 

97 137 389 0 0 8 0 0 8 

98 205 518 560 0 65 39 1 665 

99 189 501 0 10 41 0 0 51 

100 267 724 0 37 27 0 1 65 

101 277 788 0 34 62 0 0 96 

102 86 328 0 53 65 6 3 127 

103 106 249 0 0 24 0 0 24 

104 462 1232 0 4 16 0 1 21 

105 135 353 0 0 0 0 0 0 

106 284 654 0 4 12 3 0 19 

107 169 487 0 16 33 0 0 49 

108 264 590 0 27 33 0 0 60 

109 79 255 0 0 0 0 0 0 

110 182 480 0 0 8 0 0 8 

111 121 434 680 4 200 0 3 887 

112 0 0 0 80 230 0 81 391 

113 0 0 0 18 59 101 41 219 

114 0 0 0 9 98 141 112 360 

115 0 0 0 0 54 0 12 66 

116 4 14 0 16 17 19 36 88 

117 0 0 0 24 62 149 7 242 

118 0 0 0 5 276 384 105 770 

119 0 0 0 0 43 141 38 222 

120 69 95 0 0 15 4 5 24 

121 34 79 0 67 24 0 0 91 

122 0 0 0 3 7 13 150 173 

123 0 0 0 0 0 0 0 0 

124 104 255 0 11 162 4 30 207 

125 35 48 0 10 14 45 5 74 

126 0 0 0 0 0 0 0 0 

127 40 91 0 16 1916 0 0 1932 

128 0 0 0 0 8 0 0 8 

129 106 231 0 0 0 225 0 225 

130 17 17 0 32 3 0 0 35 

131 62 239 0 16 73 0 6 95 

132 93 288 0 0 11 0 0 11 

133 262 826 0 3 253 0 12 268 

134 321 916 0 0 17 0 0 17 

135 0 0 0 0 28 0 0 28 

136 3 6 0 0 1699 0 0 1699 

137 4 4 0 0 0 0 0 0 

138 40 82 453 3 329 963 29 1777 

139 527 1420 0 55 192 45 0 292 

140 110 264 0 10 3 4 0 17 

141 258 673 0 3 36 0 0 39 

142 112 235 0 0 8 0 0 8 
Macon Model 2006 Base Year Update 

35 Technical Report 

Traffic Employment 

Zone Households Pop School Retail Service Manuf Whole Total Emp 

143 170 455 0 0 8 3 0 11 

144 130 390 0 0 0 0 0 0 

145 0 0 0 89 487 13 31 620 

146 4 14 0 13 1343 0 0 1356 

147 20 62 0 0 7 0 0 7 

148 15 34 0 9 8 0 11 28 

149 0 0 0 22 22 0 69 113 

150 0 0 0 0 83 0 11 94 

151 0 0 0 46 183 0 2 231 

152 191 353 686 9 315 0 0 1010 

153 39 84 0 61 2335 0 0 2396 

154 104 209 0 0 15 4 2 21 

155 82 138 0 3 276 0 0 279 

156 226 822 577 0 160 9 0 746 

157 64 123 0 0 33 0 0 33 

158 0 0 0 0 40 0 0 40 

159 24 1410 0 0 0 0 0 0 

160 73 89 0 0 0 0 0 0 

161 0 0 3500 0 3465 0 0 6965 

162 427 980 0 0 47 0 0 47 

163 210 502 467 8 144 0 0 619 

164 138 409 0 3 31 0 0 34 

165 25 38 0 3 17 0 17 37 

166 119 276 0 0 32 19 2 53 

167 116 271 472 12 83 0 0 567 

168 71 229 0 9 32 0 0 41 

169 225 545 345 19 357 0 28 749 

170 266 872 0 13 32 0 0 45 

171 185 548 0 29 37 0 5 71 

172 187 480 0 0 17 0 11 28 

173 43 131 0 3 25 0 0 28 

174 206 482 0 8 73 0 0 81 

175 274 639 0 19 53 0 0 72 

176 270 749 0 0 18 0 0 18 

177 294 757 536 37 106 0 0 679 

178 240 513 0 5 49 0 0 54 

179 276 757 0 38 25 0 0 63 

180 430 1063 0 28 283 0 5 316 

181 148 360 0 10 60 0 2 72 

182 257 832 0 14 104 0 8 126 

183 10 24 0 3 28 4 6 41 

184 0 0 0 16 25 0 18 59 

185 0 0 0 80 65 9 0 154 

186 0 0 0 159 95 0 183 437 

187 30 98 0 58 99 986 15 1158 

188 0 0 0 0 11 1024 0 1035 

189 0 0 0 0 0 0 0 0 

190 0 0 0 19 241 148 75 483 
Macon Model 2006 Base Year Update 

36 Technical Report 

Traffic Employment 

Zone Households Pop School Retail Service Manuf Whole Total Emp 

191 0 0 0 0 39 9 30 78 

192 292 827 0 48 219 1466 100 1833 

193 0 0 0 20 18 0 35 73 

194 53 97 0 8 68 19 2 97 

195 1 3 0 0 0 0 0 0 

196 359 924 0 195 64 0 34 293 

197 484 1318 530 18 106 0 0 654 

198 318 842 0 9 47 0 0 56 

199 129 302 2195 19 331 0 6 2551 

200 0 0 0 0 3 0 0 3 

201 139 342 0 3 0 0 0 3 

202 557 1314 895 5 149 0 0 1049 

203 128 364 0 0 3 0 0 3 

204 224 379 0 0 20 0 0 20 

205 214 673 0 54 135 0 2 191 

206 409 999 0 0 94 0 66 160 

207 132 317 0 63 319 53 69 504 

208 300 654 0 0 7 0 0 7 

209 47 125 0 0 0 0 0 0 

210 84 262 0 57 268 9 0 334 

211 119 316 0 0 25 0 2 27 

212 102 313 0 329 26 0 28 383 

213 110 211 0 86 996 2569 84 3735 

214 105 197 0 8 31 0 66 105 

215 36 74 0 0 3 0 0 3 

216 137 437 0 16 107 0 0 123 

217 91 223 0 3 3 45 20 71 

218 377 922 656 185 100 0 34 975 

219 240 619 0 3 31 0 0 34 

220 144 429 0 17 138 0 0 155 

221 143 289 381 24 109 0 0 514 

222 300 812 0 18 41 0 0 59 

223 230 517 102 3 58 0 6 169 

224 369 971 0 13 27 0 0 40 

225 384 885 0 73 148 9 0 230 

226 416 1143 319 256 224 0 75 874 

227 159 379 0 264 82 9 0 355 

228 198 461 0 40 28 9 0 77 

229 20 34 0 205 35 0 61 301 

230 182 486 0 488 39 0 0 527 

231 186 470 0 73 93 0 0 166 

232 104 266 0 199 141 0 2 342 

233 0 0 1575 216 311 0 18 2120 

234 421 1039 112 16 110 0 0 238 

235 113 311 0 332 128 19 8 487 

236 59 127 0 0 28 0 0 28 

237 345 937 0 217 157 4 2 380 

238 531 1216 0 453 192 4 7 656 
Macon Model 2006 Base Year Update 

37 Technical Report 

Traffic Employment 

Zone Households Pop School Retail Service Manuf Whole Total Emp 

239 0 0 0 1831 365 17 11 2224 

240 419 1058 399 372 220 0 18 1009 

241 303 798 1800 219 517 9 0 2545 

242 84 185 0 407 587 0 0 994 

243 147 395 0 0 15 0 0 15 

244 162 419 0 14 10 0 0 24 

245 725 2077 511 27 384 9 11 942 

246 621 1546 425 22 196 0 2 645 

247 231 716 64 0 85 0 142 291 

248 767 2073 475 0 35 0 0 510 

249 548 1853 246 0 83 0 0 329 

250 534 1397 0 3 49 0 0 52 

251 273 721 0 0 36 0 0 36 

252 211 516 405 87 252 19 66 829 

253 132 356 0 246 361 13 178 798 

254 395 1028 0 188 145 0 12 345 

255 732 1630 0 39 45 0 5 89 

256 423 1056 6243 38 266 0 2 6549 

257 156 1372 0 35 461 0 0 496 

258 354 1003 0 0 3 0 0 3 

259 132 366 0 0 209 0 2 211 

260 127 301 0 5 123 4 8 140 

261 238 621 0 14 3 0 0 17 

262 327 818 790 5 105 0 0 900 

263 125 291 0 0 3 140 0 143 

264 244 672 0 0 7 0 0 7 

265 162 396 0 0 7 4 0 11 

266 41 73 0 8 61 0 0 69 

267 132 338 0 33 170 0 2 205 

268 279 774 1782 14 276 0 2 2074 

269 176 425 972 108 641 0 49 1770 

270 306 378 0 6 573 0 12 591 

271 95 260 0 18 22 13 5 58 

272 438 928 0 22 78 9 0 109 

273 470 1296 0 16 100 0 5 121 

274 256 721 0 15 75 0 0 90 

275 247 632 0 0 14 0 0 14 

276 81 218 0 3 32 0 0 35 

277 74 173 0 3 7 0 0 10 

278 169 365 0 3 7 0 0 10 

279 45 80 0 0 0 0 0 0 

280 140 307 0 0 3 0 0 3 

281 50 190 0 0 3 0 0 3 

282 1042 2775 0 9 103 0 0 112 

283 127 274 866 9 127 0 0 1002 

284 689 1585 0 6 64 0 0 70 

285 271 724 0 0 32 0 0 32 

286 247 542 0 0 11 4 0 15 
Macon Model 2006 Base Year Update 

38 Technical Report 

Traffic Employment 

Zone Households Pop School Retail Service Manuf Whole Total Emp 

287 160 387 0 19 77 0 2 98 

288 49 94 0 0 3 0 0 3 

289 54 114 0 0 0 0 0 0 

290 42 132 0 5 20 0 0 25 

291 162 467 0 0 0 0 0 0 

292 0 0 0 75 101 0 2 178 

293 194 310 0 106 498 51 6 661 

294 147 259 0 3 204 0 2 209 

295 231 337 0 38 656 0 6 700 

296 117 229 336 29 539 23 5 932 

297 396 657 0 11 670 4 66 751 

298 0 0 0 6 940 0 0 946 

299 79 213 0 867 414 9 0 1290 

300 300 548 0 3 58 0 0 61 

301 59 132 0 5 119 0 6 130 

302 213 490 0 13 84 0 15 112 

303 162 448 0 0 7 0 0 7 

304 113 231 0 0 85 0 0 85 

305 220 497 241 0 210 0 0 451 

306 137 357 0 5 3 0 0 8 

307 203 398 0 5 321 19 24 369 

308 432 683 609 159 310 4 0 1082 

309 465 836 0 0 237 0 2 239 

310 65 139 0 0 0 0 0 0 

311 245 517 0 43 280 19 0 342 

312 117 192 391 89 259 4 0 743 

313 369 843 0 143 133 0 0 276 

314 290 604 0 271 161 0 5 437 

315 0 0 440 225 42 0 0 707 

316 74 133 0 3 86 0 0 89 

317 143 388 0 43 18 0 12 73 

318 176 375 735 9 43 0 0 787 

319 79 133 1202 0 314 0 0 1516 

320 29 74 0 10 92 0 12 114 

321 166 408 0 11 180 19 32 242 

322 29 135 0 15 15 0 2 32 

323 403 1062 0 22 117 19 6 164 

324 188 532 0 5 76 0 0 81 

325 238 495 0 44 374 49 92 559 

326 93 197 0 30 53 45 0 128 

327 338 588 0 44 512 0 0 556 

328 122 216 0 206 262 32 8 508 

329 176 333 0 39 270 0 0 309 

330 93 155 0 3 113 19 0 135 

331 436 898 0 18 75 0 6 99 

332 191 290 0 3 17 0 0 20 

333 411 902 0 3 103 0 0 106 

334 468 971 0 131 161 0 8 300 
Macon Model 2006 Base Year Update 

39 Technical Report 

Traffic Employment 

Zone Households Pop School Retail Service Manuf Whole Total Emp 

335 599 1355 500 237 876 0 8 1621 

336 154 246 0 16 125 0 17 158 

337 0 0 0 30 0 0 0 30 

338 440 917 0 0 10 4 2 16 

339 284 569 0 0 30 0 0 30 

340 667 1289 422 245 250 0 5 922 

341 240 576 0 302 1111 8 16 1437 

342 227 550 0 0 10 0 0 10 

343 181 492 433 23 103 0 0 559 

344 428 1238 0 13 259 0 0 272 

345 120 370 0 0 58 4 0 62 

346 235 533 0 16 87 0 6 109 

347 59 170 0 0 126 0 0 126 

348 253 643 0 10 111 0 12 133 

349 861 2269 402 41 150 0 0 593 

350 468 1074 0 47 31 0 2 80 

351 732 1275 52 96 1176 4 2 1330 

352 343 922 0 0 24 4 2 30 

353 250 882 0 0 475 0 2 477 

354 241 716 0 3 216 0 8 227 

355 235 517 0 472 106 0 6 584 

356 139 310 0 9 91 0 6 106 

357 184 501 0 0 0 0 6 6 

358 131 362 0 3 40 0 2 45 

359 31 74 0 0 0 0 0 0 

360 190 430 0 3 209 0 6 218 

361 519 1349 1494 683 800 54 6 3037 

362 615 1363 707 16 137 0 0 860 

363 967 2585 889 40 312 0 0 1241 

364 353 1075 0 495 171 0 0 666 

365 145 464 0 0 0 0 0 0 

366 234 602 0 0 43 0 0 43 

367 135 274 0 3 0 0 0 3 

368 1 2 0 338 321 0 0 659 

369 177 403 0 773 412 0 8 1193 

370 84 232 0 162 604 37 112 915 

371 161 261 0 400 949 0 0 1349 

372 473 1434 0 0 44 0 0 44 

373 1324 3629 647 21 452 0 8 1128 

374 1006 2392 0 24 68 19 0 111 

375 656 1852 827 5 420 9 2 1263 

376 429 1084 10 3 256 0 8 277 

377 123 327 0 5 82 0 0 87 

378 24 49 1025 0 199 0 0 1224 

379 31 65 0 0 0 0 0 0 

380 93 215 0 0 0 0 0 0 

381 304 798 0 95 106 0 0 201 

382 0 0 0 0 3 45 0 48 
Macon Model 2006 Base Year Update 

40 Technical Report 

Traffic Employment 

Zone Households Pop School Retail Service Manuf Whole Total Emp 

383 172 495 0 0 68 321 6 395 

384 40 146 0 0 3 0 0 3 

385 157 306 0 0 30 0 0 30 

386 348 875 0 0 0 0 0 0 

387 86 160 0 180 70 0 6 256 

388 0 0 0 35 7 0 0 42 

389 21 235 0 17 374 0 31 422 

390 401 948 0 3 43 0 0 46 

391 196 409 0 3 26 0 0 29 

392 45 103 0 92 27 0 0 119 

393 211 506 0 40 83 39 11 173 

394 4 4 0 3 0 0 0 3 

395 98 301 0 0 3 0 0 3 

396 29 60 0 0 7 0 0 7 

397 14 79 0 9 921 0 41 971 

398 609 881 0 16 1466 9 11 1502 

399 104 281 0 19 183 0 33 235 

400 78 216 0 3 0 0 0 3 

401 264 837 0 0 368 0 0 368 

402 540 824 0 0 47 0 0 47 

403 255 408 0 119 101 0 0 220 

404 0 0 0 13 3 0 0 16 

405 0 0 0 64 172 0 0 236 

406 0 0 0 596 584 19 2 1201 

407 0 0 0 105 81 0 0 186 

408 0 0 0 96 75 0 11 182 

409 0 0 0 0 91 0 2 93 
Macon Model 2006 Base Year Update 

41 Technical Report 

Appendix B: Production and Attraction Trip Ends By Zone 

for 2006 

Traffic Production Attraction

Zone HBW HBO HBS NHB TRK IEPC IETRK HBW HBO HBS NHB TRK IEPC IETRK

1 0 0 0 153 85 306 27 239 228 24 153 85 0 0

2 0 0 0 115 66 252 1 197 188 16 115 66 0 0

3 0 0 0 66 39 151 9 118 113 0 66 39 0 0

4 0 0 0 62 27 72 3 56 54 51 62 27 0 0

5 0 0 0 111 58 203 3 158 151 43 111 58 0 0

6 6 16 3 88 47 186 0 143 163 0 88 47 0 0

7 0 0 0 82 48 178 9 139 133 8 82 48 0 0

8 0 0 0 116 51 144 5 113 107 89 116 51 0 0

9 0 0 0 106 56 174 13 136 130 51 106 56 0 0

10 0 0 0 69 42 110 9 86 82 49 69 42 0 0

11 0 0 0 95 41 90 7 70 67 95 95 41 0 0

12 0 0 0 406 242 932 4 728 694 35 406 242 0 0

13 0 0 0 66 31 93 3 72 69 43 66 31 0 0

14 8 21 3 237 110 335 9 259 255 151 237 110 0 0

15 0 0 0 319 193 769 0 600 573 0 319 193 0 0

16 0 0 0 112 68 271 0 211 202 0 112 68 0 0

17 0 0 0 0 0 0 0 0 0 0 0 0 0 0

18 0 0 0 95 41 64 136 50 48 24 95 41 0 0

19 0 0 0 780 352 498 1338 389 371 84 780 352 0 0

20 29 60 19 146 92 261 13 185 197 78 146 92 0 0

21 144 286 104 950 517 1725 30 1245 1299 373 950 517 0 0

22 0 0 0 436 247 883 123 689 658 35 436 247 0 0

23 0 0 0 175 93 306 67 239 228 35 175 93 0 0

24 0 0 0 85 44 151 2 118 113 35 85 44 0 0

25 0 0 0 194 111 418 2 326 311 32 194 111 0 0

26 0 0 0 152 61 144 8 113 107 146 152 61 0 0

27 0 0 0 616 334 1194 45 932 889 170 616 334 0 0

28 13 28 8 122 72 272 1 205 206 14 122 72 0 0

29 0 0 0 74 47 171 2 134 128 8 74 47 0 0

30 0 0 0 2 1 4 0 3 3 0 2 1 0 0

31 0 0 0 25 18 26 51 20 19 0 25 18 0 0

32 0 0 0 142 76 268 3 209 200 49 142 76 0 0

33 0 0 0 17 16 41 5 32 30 8 17 16 0 0

34 0 0 0 210 119 384 124 300 286 8 210 119 0 0

35 0 0 0 24 30 83 9 65 62 0 24 30 0 0

36 0 0 0 142 83 319 1 249 237 16 142 83 0 0

37 0 0 0 43 15 26 3 20 19 51 43 15 0 0

38 20 44 11 105 69 234 30 175 183 0 105 69 0 0

39 0 0 0 19 19 57 4 45 43 0 19 19 0 0

40 0 0 0 129 52 125 7 98 93 122 129 52 0 0

41 0 0 0 134 89 336 4 262 250 0 134 89 0 0

42 0 0 0 0 0 0 0 0 0 0 0 0 0 0

43 0 0 0 680 413 1643 0 1282 1223 0 680 413 0 0

44 0 0 0 2395 1452 5762 9 4497 4290 8 2395 1452 0 0

45 149 418 61 214 95 344 1 235 405 14 214 95 0 0
Macon Model 2006 Base Year Update 

42 Technical Report 

Traffic Production Attraction

Zone HBW HBO HBS NHB TRK IEPC IETRK HBW HBO HBS NHB TRK IEPC IETRK

46 0 0 0 373 227 901 0 703 671 0 373 227 0 0

47 221 600 97 115 31 81 0 9 258 0 115 31 0 0

48 0 0 0 6 3 7 9 5 5 0 6 3 0 0

49 7 14 5 279 123 342 13 262 256 216 279 123 0 0

50 314 776 148 194 87 270 1 122 388 14 194 87 0 0

51 48 110 26 97 52 163 52 110 145 0 97 52 0 0

52 109 250 57 89 36 76 3 23 111 59 89 36 0 0

53 161 389 79 92 41 116 1 42 177 14 92 41 0 0

54 189 436 101 128 67 219 0 108 935 0 128 67 0 0

55 102 224 57 44 22 54 0 6 87 8 44 22 0 0

56 109 254 58 50 24 67 0 17 108 0 50 24 0 0

57 310 723 159 139 65 177 0 39 292 8 139 65 0 0

58 13 29 7 33 17 55 1 38 47 14 33 17 0 0

59 675 1687 313 358 152 461 0 175 2644 8 358 152 0 0

60 154 367 78 366 138 288 20 177 300 338 366 138 0 0

61 229 509 127 235 101 239 9 106 284 154 235 101 0 0

62 384 909 192 1785 720 1635 104 1157 1419 1643 1785 720 0 0

63 40 107 17 126 50 109 56 75 111 76 126 50 0 0

64 437 1054 209 621 247 556 30 307 643 481 621 247 0 0

65 584 1526 254 398 170 552 1 283 836 16 398 170 0 0

66 370 888 179 142 61 160 0 16 315 0 142 61 0 0

67 1187 2934 548 681 287 769 126 279 1893 84 681 287 0 0

68 207 508 96 201 104 365 0 228 385 8 201 104 0 0

69 422 1034 199 242 105 300 2 115 459 41 242 105 0 0

70 754 1847 354 284 114 295 0 20 634 0 284 114 0 0

71 476 1134 229 191 130 296 34 90 457 8 191 130 0 0

72 327 704 185 868 407 1105 64 734 944 576 868 407 0 0

73 271 597 145 87 49 122 0 0 195 0 87 49 0 0

74 243 637 105 168 69 221 1 110 332 14 168 69 0 0

75 118 258 63 37 21 52 0 0 84 0 37 21 0 0

76 94 219 46 31 15 37 0 0 70 0 31 15 0 0

77 297 705 143 129 62 180 0 54 276 0 129 62 0 0

78 231 495 130 214 130 435 1 244 1854 16 214 130 0 0

79 155 331 89 56 39 103 0 11 123 0 56 39 0 0

80 19 53 8 26 9 23 1 14 33 16 26 9 0 0

81 114 270 55 44 21 57 0 11 96 0 44 21 0 0

82 141 280 99 567 264 634 128 399 489 419 567 264 0 0

83 451 983 249 550 282 849 21 498 809 211 550 282 0 0

84 785 1769 413 297 234 541 44 159 753 0 297 234 0 0

85 0 0 0 0 0 0 0 0 0 0 0 0 0 0

86 180 426 87 68 31 80 4 10 146 0 68 31 0 0

87 54 132 25 88 34 77 8 46 86 68 88 34 0 0

88 94 224 46 32 14 35 0 0 73 0 32 14 0 0

89 192 480 87 73 28 72 0 7 162 0 73 28 0 0

90 5 12 2 19 11 43 0 32 35 0 19 11 0 0

91 338 828 157 142 59 146 30 21 288 0 142 59 0 0

92 123 275 66 103 48 118 16 51 139 49 103 48 0 0

93 19 42 10 8 5 14 0 4 18 0 8 5 0 0
Macon Model 2006 Base Year Update 

43 Technical Report 

Traffic Production Attraction

Zone HBW HBO HBS NHB TRK IEPC IETRK HBW HBO HBS NHB TRK IEPC IETRK

94 206 543 87 93 36 99 1 29 207 0 93 36 0 0

95 24 63 10 11 4 11 0 3 24 0 11 4 0 0

96 47 114 22 17 7 19 0 2 38 0 17 7 0 0

97 51 127 23 19 7 19 0 2 43 0 19 7 0 0

98 357 865 168 161 107 270 22 112 1278 0 161 107 0 0

99 322 784 154 164 69 187 2 54 318 27 164 69 0 0

100 479 1181 222 273 106 255 10 69 451 100 273 106 0 0

101 509 1271 232 299 117 303 5 102 517 92 299 117 0 0

102 181 485 75 242 94 226 24 135 303 143 242 94 0 0

103 173 409 85 72 35 99 0 25 157 0 72 35 0 0

104 814 1996 380 312 124 316 5 22 677 11 312 124 0 0

105 234 571 111 83 33 84 0 0 188 0 83 33 0 0

106 448 1047 224 171 80 203 2 20 367 11 171 80 0 0

107 319 801 143 170 66 172 3 52 309 43 170 66 0 0

108 400 921 207 220 98 246 4 64 375 73 220 98 0 0

109 158 411 68 60 20 49 0 0 136 0 60 20 0 0

110 320 784 150 118 48 124 0 9 264 0 118 48 0 0

111 249 660 105 231 105 357 14 220 1528 11 231 105 0 0

112 0 0 0 496 225 532 363 415 396 216 496 225 0 0

113 0 0 0 168 161 298 227 233 222 49 168 161 0 0

114 0 0 0 331 273 490 551 382 365 24 331 273 0 0

115 0 0 0 58 31 90 52 70 67 0 58 31 0 0

116 7 19 3 131 72 122 167 93 97 43 131 72 0 0

117 0 0 0 106 173 329 103 257 245 65 106 173 0 0

118 0 0 0 406 528 1048 632 818 780 14 406 528 0 0

119 0 0 0 111 172 302 229 236 225 0 111 172 0 0

120 67 139 43 42 31 76 23 25 75 0 42 31 0 0

121 54 127 27 185 70 145 11 97 134 181 185 70 0 0

122 0 0 0 352 169 235 656 184 175 8 352 169 0 0

123 0 0 0 0 0 0 0 0 0 0 0 0 0 0

124 172 412 84 245 124 346 133 220 345 30 245 124 0 0

125 34 72 21 53 64 123 44 79 101 27 53 64 0 0

126 0 0 0 0 0 0 0 0 0 0 0 0 0 0

127 62 145 32 1138 679 2655 3 2052 2007 43 1138 679 0 0

128 0 0 0 5 3 11 0 9 8 0 5 3 0 0

129 161 368 83 55 215 372 103 239 351 0 55 215 0 0

130 12 24 9 79 31 58 5 37 45 86 79 31 0 0

131 127 342 53 148 59 168 28 101 223 43 148 59 0 0

132 181 465 79 74 27 73 0 12 164 0 74 27 0 0

133 499 1287 220 372 166 528 52 285 711 8 372 166 0 0

134 594 1483 269 226 85 223 0 18 505 0 226 85 0 0

135 0 0 0 16 10 38 0 30 28 0 16 10 0 0

136 4 10 2 959 582 2314 0 1805 1725 0 959 582 0 0

137 3 6 2 1 1 2 0 0 2 0 1 1 0 0

138 60 135 31 278 964 1827 568 1406 2110 8 278 964 0 0

139 899 2200 426 569 278 725 29 310 1052 149 569 278 0 0

140 177 418 88 87 40 92 3 18 158 27 87 40 0 0

141 450 1099 211 186 79 214 0 41 398 8 186 79 0 0
Macon Model 2006 Base Year Update 

44 Technical Report 

Traffic Production Attraction

Zone HBW HBO HBS NHB TRK IEPC IETRK HBW HBO HBS NHB TRK IEPC IETRK

142 166 376 87 60 31 81 0 9 133 0 60 31 0 0

143 301 740 140 112 47 121 1 12 253 0 112 47 0 0

144 246 626 110 92 32 81 0 0 208 0 92 32 0 0

145 0 0 0 548 280 844 154 659 628 241 548 280 0 0

146 8 21 3 790 471 1848 2 1440 1382 35 790 471 0 0

147 38 98 17 19 7 22 0 7 40 0 19 7 0 0

148 23 53 12 58 25 47 49 30 46 24 58 25 0 0

149 0 0 0 220 95 154 302 120 115 59 220 95 0 0

150 0 0 0 72 40 128 48 100 95 0 72 40 0 0

151 0 0 0 212 101 314 16 245 234 124 212 101 0 0

152 251 544 141 282 162 560 1 344 1613 24 282 162 0 0

153 56 126 30 1475 858 3286 10 2545 2473 165 1475 858 0 0

154 142 312 80 62 36 93 10 22 133 0 62 36 0 0

155 99 212 56 195 117 431 0 296 356 8 195 117 0 0

156 419 1102 189 285 118 371 4 180 1531 0 285 118 0 0

157 84 183 48 48 27 85 0 35 99 0 48 27 0 0

158 0 0 0 23 14 54 0 42 41 0 23 14 0 0

159 43 106 19 333 6 15 0 0 750 0 333 6 0 0

160 59 119 41 21 18 45 0 0 47 0 21 18 0 0

161 0 0 0 1953 1186 4716 0 3681 9109 0 1953 1186 0 0

162 617 1413 335 258 122 330 0 50 569 0 258 122 0 0

163 324 761 165 218 108 338 1 161 1168 22 218 108 0 0

164 249 629 113 121 47 132 0 36 252 8 121 47 0 0

165 27 57 16 64 32 66 74 39 58 8 64 32 0 0

166 176 406 93 88 58 146 17 56 201 0 88 58 0 0

167 170 393 91 138 67 201 2 101 995 32 138 67 0 0

168 134 347 59 93 36 100 1 44 163 24 93 36 0 0

169 354 837 177 437 222 690 124 429 1251 51 437 222 0 0

170 493 1281 219 254 87 227 2 48 510 35 254 87 0 0

171 322 808 152 228 87 212 26 75 364 78 228 87 0 0

172 302 726 149 148 63 154 48 30 284 0 148 63 0 0

173 79 201 35 52 22 65 0 30 98 8 52 22 0 0

174 321 749 163 173 82 238 1 86 339 22 173 82 0 0

175 404 935 215 224 101 269 3 76 413 51 224 101 0 0

176 467 1148 221 187 73 193 0 19 417 0 187 73 0 0

177 491 1189 235 323 139 378 6 152 1405 100 323 139 0 0

178 346 782 183 160 80 223 1 57 328 14 160 80 0 0

179 483 1192 225 280 107 258 6 67 467 103 280 107 0 0

180 692 1650 340 486 231 698 26 336 886 76 486 231 0 0

181 231 545 117 146 67 190 10 76 265 27 146 67 0 0

182 471 1219 212 306 119 331 37 134 570 38 306 119 0 0

183 16 37 8 42 24 62 28 44 54 8 42 24 0 0

184 0 0 0 92 40 80 80 63 60 43 92 40 0 0

185 0 0 0 219 94 210 17 164 156 216 219 94 0 0

186 0 0 0 832 346 595 817 464 443 430 832 346 0 0

187 54 140 25 245 932 1595 527 1230 1226 157 245 932 0 0

188 0 0 0 6 864 1409 470 1099 1049 0 6 864 0 0

189 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Macon Model 2006 Base Year Update 

45 Technical Report 

Traffic Production Attraction

Zone HBW HBO HBS NHB TRK IEPC IETRK HBW HBO HBS NHB TRK IEPC IETRK

190 0 0 0 350 299 657 396 513 490 51 350 299 0 0

191 0 0 0 90 52 106 134 83 79 0 90 52 0 0

192 504 1248 237 656 1520 2677 1114 1947 2298 130 656 1520 0 0

193 0 0 0 135 58 99 155 78 74 54 135 58 0 0

194 69 148 40 84 61 165 19 103 150 22 84 61 0 0

195 2 4 1 1 0 1 0 0 2 0 1 0 0 0

196 637 1552 296 776 301 622 178 311 789 527 776 301 0 0

197 873 2153 402 412 171 470 3 132 1675 49 412 171 0 0

198 570 1400 264 246 102 274 1 59 505 24 246 102 0 0

199 212 502 103 315 167 565 29 378 4032 51 315 167 0 0

200 0 0 0 2 1 4 0 3 3 0 2 1 0 0

201 237 568 113 88 37 91 0 3 185 8 88 37 0 0

202 922 2182 447 406 193 556 1 164 2287 14 406 193 0 0

203 239 597 108 88 33 84 0 3 197 0 88 33 0 0

204 283 611 157 101 62 167 0 21 222 0 101 62 0 0

205 411 1060 180 363 144 393 17 203 552 146 363 144 0 0

206 693 1660 331 440 201 472 286 170 694 0 440 201 0 0

207 214 505 106 555 307 768 333 535 680 170 555 307 0 0

208 465 1070 234 159 77 196 0 7 355 0 159 77 0 0

209 80 195 38 30 12 29 0 0 67 0 30 12 0 0

210 160 412 71 343 166 507 13 355 478 154 343 166 0 0

211 212 521 98 93 40 111 9 29 196 0 93 40 0 0

212 195 499 86 902 325 585 173 407 555 889 902 325 0 0

213 155 341 84 999 2682 5152 1557 3968 3898 232 999 2682 0 0

214 144 314 79 233 110 208 287 112 211 22 233 110 0 0

215 53 118 28 19 10 26 0 3 42 0 19 10 0 0

216 267 693 116 200 83 253 3 131 357 43 200 83 0 0

217 147 348 73 107 84 153 108 75 191 8 107 84 0 0

218 626 1496 304 773 310 669 176 339 1863 500 773 310 0 0

219 386 927 192 171 73 196 0 36 364 8 171 73 0 0

220 259 655 118 218 97 301 3 165 385 46 218 97 0 0

221 199 440 109 184 92 270 4 141 898 65 184 92 0 0

222 497 1210 242 256 103 267 3 63 492 49 256 103 0 0

223 338 775 177 175 85 234 26 71 506 8 175 85 0 0

224 618 1501 300 274 111 284 2 42 557 35 274 111 0 0

225 599 1398 303 459 212 552 16 244 704 197 459 212 0 0

226 725 1786 339 1150 460 1014 365 590 1681 692 1150 460 0 0

227 243 568 125 737 286 582 46 377 561 714 737 286 0 0

228 295 682 155 216 98 228 10 82 323 108 216 98 0 0

229 23 49 14 634 243 422 296 320 323 554 634 243 0 0

230 321 786 149 1248 447 831 77 560 793 1319 1248 447 0 0

231 308 743 148 330 136 342 11 176 418 197 330 136 0 0

232 172 415 83 600 235 530 40 363 488 538 600 235 0 0

233 0 0 0 708 297 742 112 579 3071 584 708 297 0 0

234 700 1675 339 344 155 433 3 134 860 43 344 155 0 0

235 198 487 92 920 361 733 96 517 659 897 920 361 0 0

236 88 200 46 46 24 75 0 30 96 0 46 24 0 0

237 579 1410 283 809 318 732 45 404 884 587 809 318 0 0
Macon Model 2006 Base Year Update 

46 Technical Report 

Traffic Production Attraction

Zone HBW HBO HBS NHB TRK IEPC IETRK HBW HBO HBS NHB TRK IEPC IETRK

238 818 1904 412 1443 569 1223 103 697 1312 1224 1443 569 0 0

239 0 0 0 4401 1610 3027 343 2362 2254 4949 4401 1610 0 0

240 685 1646 333 1262 494 1091 136 648 1819 1005 1262 494 0 0

241 513 1247 246 979 434 1203 39 791 4058 592 979 434 0 0

242 127 292 64 1302 546 1405 64 1056 1106 1100 1302 546 0 0

243 254 624 119 102 42 112 0 16 225 0 102 42 0 0

244 278 677 131 137 55 133 2 25 247 38 137 55 0 0

245 1311 3274 602 794 352 1038 56 458 2359 73 794 352 0 0

246 1047 2518 501 531 241 686 12 234 1725 59 531 241 0 0

247 442 1137 193 541 231 453 615 241 713 0 541 231 0 0

248 1345 3302 630 510 202 525 0 37 1898 0 510 202 0 0

249 1066 2806 457 485 164 454 0 88 1464 0 485 164 0 0

250 919 2244 431 365 152 403 0 55 796 8 365 152 0 0

251 446 1080 220 191 80 219 0 38 420 0 191 80 0 0

252 352 841 170 613 291 708 308 450 1352 235 613 291 0 0

253 219 535 106 1253 545 1168 815 848 998 665 1253 545 0 0

254 675 1645 318 780 310 715 81 366 897 508 780 310 0 0

255 1103 2542 563 511 233 577 28 95 958 105 511 233 0 0

256 707 1699 341 491 228 680 15 325 10856 103 491 228 0 0

257 274 681 125 664 224 772 5 527 1233 95 664 224 0 0

258 652 1625 297 239 89 224 0 3 537 0 239 89 0 0

259 243 603 111 209 106 369 9 224 409 0 209 106 0 0

260 209 496 102 170 89 270 37 149 302 14 170 89 0 0

261 422 1033 196 180 71 171 2 18 348 38 180 71 0 0

262 558 1345 266 264 121 353 1 117 1810 14 264 121 0 0

263 205 484 100 71 150 272 64 152 300 0 71 150 0 0

264 447 1105 204 163 63 161 0 7 365 0 163 63 0 0

265 271 648 131 98 46 116 2 12 222 0 98 46 0 0

266 55 121 30 70 37 119 1 73 109 22 70 37 0 0

267 230 558 108 255 119 361 14 218 388 89 255 119 0 0

268 510 1264 233 375 177 571 11 310 3558 38 375 177 0 0

269 295 703 142 819 399 1196 229 848 2589 292 819 399 0 0

270 254 513 171 453 289 995 53 628 800 16 453 289 0 0

271 169 418 79 126 61 138 30 62 197 49 126 61 0 0

272 668 1523 341 314 160 421 8 116 604 59 314 160 0 0

273 862 2134 394 411 169 457 24 129 812 43 411 169 0 0

274 475 1184 216 247 101 282 2 96 475 41 247 101 0 0

275 433 1054 203 157 66 173 0 15 350 0 157 66 0 0

276 145 358 67 76 33 98 0 37 151 8 76 33 0 0

277 119 279 59 52 23 60 0 11 102 8 52 23 0 0

278 253 578 132 97 47 119 0 11 204 8 97 47 0 0

279 59 129 33 19 11 28 0 0 43 0 19 11 0 0

280 212 486 109 74 36 91 0 3 166 0 74 36 0 0

281 106 284 44 47 13 35 0 3 104 0 47 13 0 0

282 1862 4573 863 735 301 801 1 119 1590 24 735 301 0 0

283 192 438 99 157 82 264 1 144 1669 24 157 82 0 0

284 1121 2632 548 425 198 524 1 74 914 16 425 198 0 0

285 490 1206 226 189 78 212 0 34 418 0 189 78 0 0
Macon Model 2006 Base Year Update 

47 Technical Report 

Traffic Production Attraction

Zone HBW HBO HBS NHB TRK IEPC IETRK HBW HBO HBS NHB TRK IEPC IETRK

286 375 861 193 134 68 174 2 16 304 0 134 68 0 0

287 273 653 130 183 83 233 12 104 305 51 183 83 0 0

288 70 154 37 24 13 35 0 3 53 0 24 13 0 0

289 83 190 42 27 13 34 0 0 61 0 27 13 0 0

290 82 212 36 54 21 60 1 27 96 14 54 21 0 0

291 305 766 137 110 40 101 0 0 249 0 110 40 0 0

292 0 0 0 232 96 242 20 189 180 203 232 96 0 0

293 215 453 127 609 352 1020 66 702 835 287 609 352 0 0

294 188 405 105 188 111 376 9 222 350 8 188 111 0 0

295 237 499 143 550 318 1097 32 744 889 103 550 318 0 0

296 163 361 88 435 261 884 37 633 1263 78 435 261 0 0

297 447 941 271 708 407 1269 289 798 1111 30 708 407 0 0

298 0 0 0 544 327 1288 1 1005 959 16 544 327 0 0

299 140 343 65 2258 860 9025 140 1370 1421 2343 2258 860 0 0

300 409 892 223 169 97 270 0 65 353 8 169 97 0 0

301 84 191 46 123 65 214 27 138 202 14 123 65 0 0

302 313 720 166 227 107 285 67 119 374 35 227 107 0 0

303 276 678 131 110 43 110 0 7 245 0 110 43 0 0

304 154 339 87 103 57 186 0 90 209 0 103 57 0 0

305 327 753 170 236 126 423 0 223 863 0 236 126 0 0

306 224 542 110 98 39 96 1 9 198 14 98 39 0 0

307 279 614 153 341 205 629 113 392 586 14 341 205 0 0

308 468 982 282 698 343 913 27 502 1817 430 698 343 0 0

309 614 1334 338 336 199 615 9 254 687 0 336 199 0 0

310 99 227 50 33 16 40 0 0 74 0 33 16 0 0

311 349 785 187 378 207 618 15 363 622 116 378 207 0 0

312 137 292 78 394 192 552 16 374 1084 241 394 192 0 0

313 577 1347 287 600 251 605 22 293 728 387 600 251 0 0

314 432 978 224 862 348 775 64 464 764 732 862 348 0 0

315 0 0 0 536 194 363 35 284 974 608 536 194 0 0

316 99 217 54 87 50 167 0 95 161 8 87 50 0 0

317 239 583 115 227 88 188 59 78 280 116 227 88 0 0

318 253 572 135 133 66 180 1 55 1428 24 133 66 0 0

319 94 200 54 208 127 477 0 334 2311 0 208 127 0 0

320 46 111 23 119 59 173 54 121 155 27 119 59 0 0

321 267 637 131 296 160 433 149 257 462 30 296 160 0 0

322 65 181 26 79 26 62 11 34 104 41 79 26 0 0

323 667 1619 323 381 180 474 38 174 731 59 381 180 0 0

324 334 829 154 180 77 227 1 86 365 14 180 77 0 0

325 340 764 181 638 357 909 428 594 830 119 638 357 0 0

326 133 300 71 145 103 232 25 136 235 81 145 103 0 0

327 425 916 238 528 294 967 7 591 876 119 528 294 0 0

328 154 331 88 686 319 767 82 540 630 557 686 319 0 0

329 240 528 130 320 167 530 6 328 490 105 320 167 0 0

330 113 245 63 107 80 242 9 143 219 8 107 80 0 0

331 640 1442 332 309 154 406 29 105 578 49 309 154 0 0

332 210 447 121 85 56 146 0 21 175 8 85 56 0 0

333 638 1470 320 278 140 400 0 113 587 8 278 140 0 0
Macon Model 2006 Base Year Update 

48 Technical Report 

Traffic Production Attraction

Zone HBW HBO HBS NHB TRK IEPC IETRK HBW HBO HBS NHB TRK IEPC IETRK

334 691 1562 357 637 284 700 55 319 821 354 637 284 0 0

335 937 2183 465 1372 646 1899 72 1191 2657 641 1372 646 0 0

336 173 368 100 204 111 311 76 168 291 43 204 111 0 0

337 0 0 0 68 24 41 5 32 30 81 68 24 0 0

338 659 1491 340 227 118 296 10 17 504 0 227 118 0 0

339 419 936 219 152 81 218 0 32 333 0 152 81 0 0

340 947 2095 506 1015 451 1096 60 531 1868 662 1015 451 0 0

341 394 937 190 1487 704 2105 120 1526 1763 816 1487 704 0 0

342 383 914 183 136 60 155 0 11 303 0 136 60 0 0

343 310 760 146 227 99 284 4 134 1082 62 227 99 0 0

344 766 1918 351 468 205 637 2 289 934 35 468 205 0 0

345 217 552 100 120 53 159 2 66 260 0 120 53 0 0

346 350 809 181 225 107 295 28 116 394 43 225 107 0 0

347 108 270 49 111 58 208 0 134 218 0 111 58 0 0

348 419 1012 202 265 121 338 54 141 477 27 265 121 0 0

349 1497 3657 704 715 298 796 6 203 2044 111 715 298 0 0

350 719 1673 363 383 166 400 16 85 653 127 383 166 0 0

351 954 2070 524 1188 666 2195 26 1358 2057 259 1188 666 0 0

352 624 1539 286 236 99 254 10 32 521 0 236 99 0 0

353 521 1382 219 481 227 805 9 507 953 0 481 227 0 0

354 470 1195 206 316 144 459 35 241 611 8 316 144 0 0

355 364 839 183 1271 477 941 100 620 867 1276 1271 477 0 0

356 206 473 107 159 79 231 27 113 272 24 159 79 0 0

357 318 783 149 132 52 123 26 6 273 0 132 52 0 0

358 242 601 110 120 51 143 9 48 238 8 120 51 0 0

359 52 124 25 18 8 19 0 0 39 0 18 8 0 0

360 306 714 150 240 127 415 26 232 450 8 240 127 0 0

361 916 2238 426 2339 999 2423 158 1639 4671 1846 2339 999 0 0

362 956 2215 476 436 212 591 3 163 2011 43 436 212 0 0

363 1729 4250 801 878 379 1081 6 374 3154 108 878 379 0 0

364 691 1773 302 1478 541 1126 78 707 1247 1338 1478 541 0 0

365 281 730 123 110 36 90 0 0 247 0 110 36 0 0

366 402 975 191 167 73 204 0 46 364 0 167 73 0 0

367 203 457 104 72 36 88 0 3 149 8 72 36 0 0

368 1 3 1 951 380 4488 53 700 669 914 951 380 0 0

369 271 631 137 2106 809 8670 156 1267 1424 2089 2106 809 0 0

370 155 384 71 1019 502 1298 527 972 1051 438 1019 502 0 0

371 191 408 108 1508 684 1936 63 1433 1506 1081 1508 684 0 0

372 933 2391 407 364 132 354 0 47 808 0 364 132 0 0

373 2426 6002 1109 1179 508 1479 38 511 3453 57 1179 508 0 0

374 1678 3984 809 659 308 777 12 118 1385 65 659 308 0 0

375 1224 3051 553 691 320 1002 14 463 2750 14 691 320 0 0

376 754 1828 352 426 205 630 35 284 863 8 426 205 0 0

377 223 548 102 135 63 195 1 92 262 14 135 63 0 0

378 36 82 19 124 74 286 0 211 1867 0 124 74 0 0

379 47 106 24 15 8 19 0 0 35 0 15 8 0 0

380 150 351 74 51 23 58 0 0 114 0 51 23 0 0

381 532 1299 249 465 187 463 15 214 628 257 465 187 0 0
Macon Model 2006 Base Year Update 

49 Technical Report 

Traffic Production Attraction

Zone HBW HBO HBS NHB TRK IEPC IETRK HBW HBO HBS NHB TRK IEPC IETRK

382 0 0 0 2 39 65 21 51 49 0 2 39 0 0

383 325 815 146 169 342 645 173 420 664 0 169 342 0 0

384 80 213 34 36 11 29 0 3 81 0 36 11 0 0

385 216 476 118 89 49 139 0 32 193 0 89 49 0 0

386 585 1410 281 207 86 217 0 0 466 0 207 86 0 0

387 113 246 64 501 195 402 54 272 345 487 501 195 0 0

388 0 0 0 84 30 57 5 45 43 95 84 30 0 0

389 36 89 16 376 178 587 137 448 553 46 376 178 0 0

390 616 1442 313 255 117 312 0 49 551 8 255 117 0 0

391 285 642 149 118 60 161 0 31 247 8 118 60 0 0

392 69 162 35 249 94 190 14 126 175 249 249 94 0 0

393 326 767 166 283 157 367 72 184 445 108 283 157 0 0

394 3 6 2 8 3 7 0 3 5 8 8 3 0 0

395 174 443 81 73 25 65 0 3 163 0 73 25 0 0

396 39 86 22 18 10 28 0 7 39 0 18 10 0 0

397 23 56 11 652 368 1330 179 1031 1026 24 652 368 0 0

398 650 1383 381 1096 685 2423 54 1596 1991 43 1096 685 0 0

399 183 448 85 288 137 385 146 250 388 51 288 137 0 0

400 144 357 66 58 22 53 0 3 118 8 58 22 0 0

401 504 1301 222 405 192 665 0 391 818 0 405 192 0 0

402 605 1289 349 221 150 400 0 50 486 0 221 150 0 0

403 292 619 170 424 193 458 19 234 440 322 424 193 0 0

404 0 0 0 31 11 22 2 17 16 35 31 11 0 0

405 0 0 0 243 110 321 10 251 239 173 243 110 0 0

406 0 0 0 1691 693 1635 111 1276 1217 1611 1691 693 0 0

407 0 0 0 285 111 253 16 198 189 284 285 111 0 0

408 0 0 0 286 113 248 63 193 184 259 286 113 0 0

409 0 0 0 56 33 127 9 99 94 0 56 33 0 0

410 0 0 0 0 0 0 0 0 0 0 0 0 0 0

411 0 0 0 0 0 0 0 0 0 0 0 0 0 0

412 0 0 0 0 0 0 0 0 0 0 0 0 0 0

413 0 0 0 0 0 0 0 0 0 0 0 0 0 0

414 0 0 0 0 0 0 0 0 0 0 0 0 3 8593 7719

415 0 0 0 0 0 0 0 0 0 0 0 0 3734 197

416 0 0 0 0 0 0 0 0 0 0 0 0 3249 171

417 0 0 0 0 0 0 0 0 0 0 0 0 4978 105

418 0 0 0 0 0 0 0 0 0 0 0 0 1007 53

419 0 0 0 0 0 0 0 0 0 0 0 0 456 24

420 0 0 0 0 0 0 0 0 0 0 0 0 2321 273

421 0 0 0 0 0 0 0 0 0 0 0 0 2223 99

422 0 0 0 0 0 0 0 0 0 0 0 0 2 9815 2982

423 0 0 0 0 0 0 0 0 0 0 0 0 3630 342

424 0 0 0 0 0 0 0 0 0 0 0 0 2 634 3439

425 0 0 0 0 0 0 0 0 0 0 0 0 1581 167

426 0 0 0 0 0 0 0 0 0 0 0 0 7234 681

427 0 0 0 0 0 0 0 0 0 0 0 0 1530 81

428 0 0 0 0 0 0 0 0 0 0 0 0 1 5402 1450

429 0 0 0 0 0 0 0 0 0 0 0 0 2502 136
Macon Model 2006 Base Year Update 

50 Technical Report 

Traffic Production Attraction

Zone HBW HBO HBS NHB TRK IEPC IETRK HBW HBO HBS NHB TRK IEPC IETRK

430 0 0 0 0 0 0 0 0 0 0 0 0 7073 650

431 0 0 0 0 0 0 0 0 0 0 0 0 1593 89

432 0 0 0 0 0 0 0 0 0 0 0 0 5211 539

433 0 0 0 0 0 0 0 0 0 0 0 0 808 43

434 0 0 0 0 0 0 0 0 0 0 0 0 1801 186

435 0 0 0 0 0 0 0 0 0 0 0 0 589 31

436 0 0 0 0 0 0 0 0 0 0 0 0 1 3428 1119

437 0 0 0 0 0 0 0 0 0 0 0 0 2801 290

438 0 0 0 0 0 0 0 0 0 0 0 0 2 1933 2269

439 0 0 0 0 0 0 0 0 0 0 0 0 6830 707

440 0 0 0 0 0 0 0 0 0 0 0 0 5896 254
Macon Model 2006 Base Year Update 

51 Technical Report 

Appendix C: Travel Demand Model Validation Sample Report 

Travel Demand Model Validation Report

Calibration Measure Target Range / Value MATS 2006 Model

Socio-Economic Data

Persons / Household 2 - 4 2.5

Workers / Household 1 - 3 1.5

Trip Generation

Person Trips Per Household 8.5 - 9.2 8.2

Person Trips Per Person 3 - 4 3.3

HBW Trips / Employee < 2 1.1

Shopping Trips / Retail Employment - 2.7

P/A Ratio Before Balancing (HBW) 0.9 - 1.1 0.9

P/A Ratio Before Balancing (HBO) 0.9 - 1.1 1.1

P/A Ratio Before Balancing (HBShop) 0.9 - 1.1 1.0

P/A Ratio Before Balancing (NHB) 0.9 - 1.1 0.8

Trip Distribution

Average Trip Length (HBW) 22.2 21.8

Average Trip Length (HBO) 17.8 16.8

Average Trip Length (HBShop) 17.8 16.3

Average Trip Length (NHB) 16.6 16.4

Average Trip Length (Truck) N/A 0.0

% Intrazonal Trips < 10% 0.4%

Trip Assignment

VMT-Interstates 2,381,608 2,316,953

VMT-Principal Arterials 966,347 968,211

VMT-Minor Arterials 1,242,472 1,297,517

VMT-Collectors 493,135 511,537

VMT-Total 5,083,561 5,094,218

VMT / Household 71.8 72.0

VMT / Person 28.9 28.9

Screenlines

All Counts +/- 9 % 1%

East of I-16 +/- 23 % 1%

West of I -16 +/- 22 % 3%

North of Macon +/- 17 % 3%

West of Macon +/- 36 % 3%

Central Macon +/- 19 % 0%

Far South of Macon +/- 23 % -1%

South of Macon +/- 20 % 1%

Far North of Macon +/- 21 % -1%

East of I-75 +/- 26 % 0%

South of Downtown +/- 23 % -3%
Macon Model 2006 Base Year Update 

52 Technical Report 

Travel Demand Model Validation Report

Calibration Measure Target Range / Value MATS 2006 Model

RMSE = Root Mean Squared Error (Vol) < 30% 8%

% RMSE (0-5K) < 100% 27%

% RMSE (5K-10K) < 75% 15%

% RMSE (10K-15K) < 50% 7%

% RMSE (15K-20K) < 30% 11%

% RMSE (20K-30K) < 30% 10%

% RMSE (>30K) < 30% 4%