Model Inventory of Roadway Elements 

Fundamental Data Elements (MIRE FDE): 

Example Illustrations

FHWA-SA-22-058

Source: FHWA

May 2022
FHWA MIRE FDE

2

Technical Report Documentation Page

1. REPORT NO.

FHWA-SA-22-058

2. GOVERNMENT ACCESSION 

NO. 

3. RECIPIENT'S CATALOG 

NO. 

4. TITLE AND SUBTITLE

Model Inventory of Roadway Elements Fundamental Data Elements 

(MIRE FDE): Example Illustrations

5. REPORT DATE 

May 2022

6. PERFORMING 

ORGANIZATION CODE

7. AUTHOR(S)

Annette Gross (VHB), Scott Himes (VHB), and Bob Scopatz (VHB)

8. PERFORMING 

ORGANIZATION REPORT NO.

9. PERFORMING ORGANIZATION NAME & ADDRESS 10. WORK UNIT NO.

11. CONTRACT OR GRANT 

NO.

DTFH61-16-D-00052

VHB 

940 Main Campus Dr Ste 500 

Raleigh, NC 27606

12. SPONSORING AGENCY NAME AND ADDRESS 

U.S. Department of Transportation 

Federal Highway Administration 

1200 New Jersey Avenue, SE 

Washington, DC 20590

13. TYPE OF REPORT AND 

PERIOD 

14. SPONSORING AGENCY 

CODE 

FHWA

15. SUPPLEMENTARY NOTES

The Task Order Contracting Officer's Representative (TOCOR) for this task was Sarah Weissman Pascual.

16. ABSTRACT

MIRE provides a comprehensive listing of roadway and traffic data elements and accompanying data 

dictionary that serves as a model of a robust inventory to support data-driven safety decision making. MIRE 

2.0 provides an update of the previous version of MIRE. This guide illustrates the list of MIRE Fundamental 

Data Elements (FDE) by roadway category, MIRE 2.0 element number, definition, and recommended 

attributes.

17. KEY WORDS

Model Inventory of Roadway Elements (MIRE), Fundamental Data 

Elements (FDE), safety data, roadway inventory data, traffic data, data 

collection

18. DISTRIBUTION 

STATEMENT

No restrictions.

19. SECURITY CLASSIF. (OF 

THIS REPORT) Unclassified

20. SECURITY CLASSIF. (OF 

THIS PAGE) Unclassified

21. NO. OF 

PAGES 74

22. 

PRICE

Form DOT F 1700.7 (8-72) Reproduction of completed page authorized.
FHWA MIRE FDE

3

CONTENTS

ACRONYMS ...............................................................................................................................5

DEFINITIONS..............................................................................................................................5

HOW TO USE THIS DOCUMENT ..............................................................................................6

NON-LOCAL PAVED ROADS ....................................................................................................8

Roadway Segment ........................................................................................................................................... 8

 Segment Identifier (12) .............................................................................................................................. 9

 Route Number (8)..................................................................................................................................... 10

 Route/Street Name (9) ............................................................................................................................. 11

 Federal Aid (21) ........................................................................................................................................ 12

 Route Type (22) ........................................................................................................................................ 13

 Rural/Urban Designation (20) ................................................................................................................. 14

 Surface Type (24) ..................................................................................................................................... 15

 Begin Point Segment Descriptor (10)..................................................................................................... 16

 End Point Segment Descriptor (11) ........................................................................................................ 17

 Segment Length (13) ............................................................................................................................... 18

 Direction of Inventory (18) ....................................................................................................................... 19

 Functional Class (19) ............................................................................................................................... 20

 Median Type (55) ...................................................................................................................................... 21

 Access Control (23) ................................................................................................................................. 22

 One/Two-Way Operations (93) ................................................................................................................ 23

 Number of Through Lanes (32) ............................................................................................................... 24

 Annual Average Daily Traffic (AADT) (81) ............................................................................................... 25

 AADT Year (82) ......................................................................................................................................... 26

 Type of Governmental Ownership (4) .................................................................................................... 27

Intersection ..................................................................................................................................................... 28

 Unique Junction Identifier (110) ............................................................................................................. 29

 Location Identifier for Road 1 Crossing Point (112) ............................................................................. 30

 Location Identifier for Road 2 Crossing Point (113) ............................................................................. 31

 Intersection/Junction Geometry (116) ................................................................................................... 32

 Intersection/Junction Traffic Control (121)............................................................................................ 33

 Approach AADT (130) [for Each Intersecting Road] ............................................................................. 34

 Approach AADT Year (131) [for Each Intersecting Road] .................................................................... 35

 Unique Approach Identifier (129)............................................................................................................ 36

Intersection: Circular...................................................................................................................................... 37

 Unique Junction Identifier (110) ............................................................................................................. 38

 Location Identifier for Road 1 Crossing Point (112) ............................................................................. 39

 Location Identifier for Road 2 Crossing Point (113) ............................................................................. 40
FHWA MIRE FDE

4

 Intersection/Junction Geometry (116) ................................................................................................... 41

 Intersection/Junction Traffic Control (121)............................................................................................ 42

 Approach AADT (130) [for Each Intersecting Road] ............................................................................. 43

 Approach AADT Year (131) [for Each Intersecting Road] .................................................................... 44

 Unique Approach Identifier (129)............................................................................................................ 45

Interchange/Ramp.......................................................................................................................................... 46

 Unique Interchange Identifier (168) ........................................................................................................ 47

 Location Identifier for Roadway at Beginning Ramp Terminal (187) .................................................. 48

 Location Identifier for Roadway at Ending Ramp Terminal (191) ........................................................ 49

 Ramp Length (177)................................................................................................................................... 50

 Roadway Type at Beginning Ramp Terminal (185)................................................................................ 51

 Roadway Type at Ending Ramp Terminal (189) ..................................................................................... 52

 Interchange Type (172) ............................................................................................................................ 53

 Ramp AADT (181)..................................................................................................................................... 54

 Year of Ramp AADT (182) ........................................................................................................................ 55

 Functional Class (19) ............................................................................................................................... 56

 Type of Governmental Ownership (4) ..................................................................................................... 57

LOCAL PAVED ROADS ............................................................................................................58

Roadway Segment ......................................................................................................................................... 58

 Segment Identifier (12) ........................................................................................................................... 59

 Functional Class (19) ............................................................................................................................... 60

 Surface Type (24) .................................................................................................................................... 61

 Type of Governmental Ownership (4) ..................................................................................................... 62

 Number of Through Lanes (32) .............................................................................................................. 63

 Annual Average Daily Traffic (81) ........................................................................................................... 64

 Begin Point Segment Descriptor (10) .................................................................................................... 65

 End Point Segment Descriptor (11) ....................................................................................................... 66

 Rural/Urban Designation (20) ................................................................................................................. 67

UNPAVED ROADS ....................................................................................................................68

Roadway Segment ......................................................................................................................................... 68

 Segment Identifier (12) ........................................................................................................................... 69

 Functional Class (19) ............................................................................................................................... 70

 Type of Governmental Ownership (4) .................................................................................................... 71

 Begin Point Segment Descriptor (10)..................................................................................................... 72

 End Point Segment Descriptor (11) ........................................................................................................ 73
FHWA MIRE FDE

5

ACRONYMS

AADT Annual Average Daily Traffic

AC Asphalt-Concrete

ARNOLD All Road Network of Linear Referenced Data

CFI Continuous Flow Intersection

CRCP Reinforced Concrete Pavement

DCD Double-Crossover Diamond

DLT Displaced Left-Turn

FDE Fundamental Data Elements

FHWA Federal Highway Administration

HAWK High-Intensity Activated Crosswalk

HOT High-Occupancy Toll

HOV High-Occupancy Vehicle

HPMS Highway Performance Monitoring System

HSIP Highway Safety Improvement Program

JPCP Jointed Plain Concrete Pavement

JRCP Jointed Reinforced Concrete Pavement

LRS Linear Referencing System

MAP-21 Moving Ahead for Progress in the 

21st Century Act

MIRE Model Inventory of Roadway Elements

mph Miles Per Hour

MUT Median U-Turn

NHS National Highway System

PCC Portland Cement Concrete

PHB Pedestrian Hybrid Beacon

SPI Single Point Interchange

DEFINITIONS

The following terms found in this guide are defined as such:

Roadway: The portion of a highway intended for vehicular use.1

Non-local paved roads: Arterials and collectors.2

1 FHWA. (2016). Highway Performance Monitoring System Field Manual. Office of Highway Policy Information. 

https://www.fhwa.dot.gov/policyinformation/hpms/fieldmanual/hpms_field_manual_dec2016.pdf.

2 FHWA. (2016). Highway Safety Improvement Program. Federal Register. 

https://www.federalregister.gov/documents/2016/03/15/2016-05190/highway-safety-improvement-program.
FHWA MIRE FDE

6

HOW TO USE THIS DOCUMENT

Background

Data are key to making sound decisions on the safety 

performance of roadways. Critical data include not only 

crash, but roadway and traffic data as well. In 2010, 

the FHWA published the Model Inventory of Roadway 

Elements - MIRE, Version 1.0 (MIRE 1.0). MIRE provides 

a comprehensive listing of roadway and traffic data 

elements and accompanying data dictionary that serves 

as a model of a robust inventory to support data-driven 

safety decision making. MIRE is a recommended 

guideline of data elements that States could collect 

to develop a comprehensive roadway and traffic data 

inventory for safety management. 

Since FHWA released MIRE 1.0, safety analysis techniques 

have advanced, and both the safety and data communities 

have developed an increased awareness of the importance 

of quality data in safety analysis. Additionally, there are 

new Federal requirements for related data, including the 

Highway Performance Monitoring System Field Manual 

All Road Network of Linear Referenced Data (HPMS 

ARNOLD). The HPMS ARNOLD requirement expanded 

State obligation to include all public roads into a State’s 

Linear Referencing System (LRS) base map. This LRS 

requirement provides at least one means to geospatially 

locate MIRE data elements. 

In response to these changes, FHWA initiated a 

reassessment of MIRE 1.0. The reassessment resulted 

in MIRE 2.0.

The Moving Ahead for Progress in the 21st Century Act 

(MAP-21) required the Secretary of Transportation to 

establish a subset of the MIRE that are useful for the 

inventory of roadway safety and ensure that States adopt 

and use the subset to improve data collection. [23 U.S.C. 

148(f)(2)]. The FHWA established a subset of the MIRE as 

part of the Highway Safety Improvement Program (HSIP)

Final Rule changes to 23 CFR Part 924, effective April 14, 

2016. This subset is referred to as the fundamental data 

elements (FDEs). The FDEs are categorized by roadway 

functional classification and surface type and include 

three tables, one each for non-local paved roads, local 

paved roads, and unpaved roads They are further refined 

into subcategories of data elements for road segments, 

intersections and interchanges for non-local paved 

roads.

Element Tier Categories

The MIRE FDE is comprised of 37 data elements. 

Recognizing the challenges States would face in 

collecting all 37 elements on all public roads, FHWA 

tiered the FDE based on functional class and surface 

type. This guide is organized into three categories and 

four subcategories that follow the MIRE 1.0 order shown 

in FHWA’s Guidance on State Safety Data Systems 

issued March 15, 2016.

1. Non-local paved roads.

• Segments.

• Intersection.

• Intersection: Circular.

• Interchange/Ramps. 

2. Local paved roads.

3. Unpaved roads.

To learn more, see the Model Inventory 

of Roadway Elements MIRE 2.0 (FHWASA-17-048) report.
FHWA MIRE FDE

7

Key

1 Roadway Category.

2 Roadway Components.*

3 Fundamental Data Element.

4 MIRE 2.0 Number.

5 Definition of FDE.

6 Recommended Attributes.

7 Data is required for the Highway 

Performance Monitoring System Field 

Manual (HPMS).

8 Base Illustration.

9 Element Detail.

 

 

 

 

 

 

Source: FHWA

*Termed “Data Type” in MIRE 2.0.
8

NON-LOCAL PAVED ROADS

Roadway Segment

FHWA MIRE FDE
FHWA MIRE FDE

9

NON-LOCAL PAVED ROADS

Roadway Segment

Definition: Unique segment identifier.

Recommended Attributes: Derived from other elements (e.g., combination of route number, 

county location and beginning and ending milepoints). 

Segment Identifier (12)

Source: FHWA
FHWA MIRE FDE

10

NON-LOCAL PAVED ROADS

Roadway Segment

Definition: The signed route number.

Recommended Attributes: Signed numeric value for the roadway segment. 

Note: Descriptive route name information should be included in Element 9. Route/Street Name.

Route Number (8)

Source: FHWA
FHWA MIRE FDE

11

NON-LOCAL PAVED ROADS

Roadway Segment

Definition: The route or street name, where different from Element 8. Route Number. 

Recommended Attributes: The alphanumeric route or street name. 

Route/Street Name (9)

Source: FHWA
FHWA MIRE FDE

12

NON-LOCAL PAVED ROADS

Roadway Segment

Definition: Indicate the system on which the route is located. 

Recommended Attributes: 

1. Route is non Federal-aid. 

2. Route is Federal-aid, but not on National Highway System (NHS) (i.e., all non-NHS routes functionally 

classified as Interstate, Other Freeways & Expressways, Other Principal Arterials, Minor Arterials, Major 

Collectors, and Urban Minor Collectors). 

3. Route is on NHS. 

Note: This element has been changed since MIRE 1.0. In MIRE 1.0, elements 21 Federal Aid and 22 Route 

Type were a single combined element. In MIRE 2.0, they are separate elements.

Federal Aid (21)

Source: FHWA
FHWA MIRE FDE

13

NON-LOCAL PAVED ROADS

Roadway Segment

Route Type (22)

Definition: Federal-aid/NHS route type.

Recommended Attributes: 

1. Non Connector NHS. 

2. Major Airport. 

3. Major Port Facility. 

4. Major Amtrak Station. 

5. Major Rail/Truck Terminal. 

6. Major Inter City Bus Terminal. 

7. Major Public Transportation or Multi-Modal 

Passenger Terminal. 

8. Major Pipeline Terminal. 

9. Major Ferry Terminal. 

Note: This element has been changed since MIRE 

1.0. In MIRE 1.0, elements 21 Federal Aid and 22 

Route Type were a single combined element. In 

MIRE 2.0, they are separate elements.

Source: FHWA
FHWA MIRE FDE

14

NON-LOCAL PAVED ROADS

Roadway Segment

Rural/Urban Designation (20)

Definition: The rural or urban designation based on Census urban boundary and population.

Recommended Attributes: 

1. Rural. 

2. Urban (population > 5,000). 

Source: FHWA
FHWA MIRE FDE

15

NON-LOCAL PAVED ROADS

Roadway Segment

Surface Type (24)

Definition: The surface type of the segment.

Recommended Attributes: 

1. Unpaved. 

a. Dirt. b. Gravel. c. Other. 

2. Bituminous. 

3. Jointed Plain Concrete 

Pavement (JPCP). 

4. Jointed Reinforced 

Concrete Pavement 

(JRCP). 

5. Continuously 

Reinforced Concrete 

Pavement (CRCP). 

6. Asphalt-Concrete (AC) 

Overlay over Existing 

AC Pavement. 

7. AC Overlay over 

Existing Jointed 

Concrete Pavement. 

8. AC (Bi Overlay over 

Existing CRCP). 

9. Unbonded Jointed 

Concrete Overlay 

on Portland Cement 

Concrete (PCC) 

Pavements. 

10. Unbonded CRCP 

Overlay on PCC 

Pavements. 

11. Bonded PCC Overlays 

on PCC Pavements. 

12. Other. 

Note: This element 

has been changed 

since MIRE 1.0. To 

facilitate safety 

analyses, it is 

recommended that 

the type of surface for 

unpaved roads be more 

specifically identified.

Source: FHWA
FHWA MIRE FDE

16

NON-LOCAL PAVED ROADS

Roadway Segment

Definition: Location information defining the beginning of the segment. 

Recommended Attributes: Begin point will be defined by the user agency. Generally, this will be 

based on homogeneity of chosen attributes throughout the segment. Begin point segment descriptors 

can be either linked to a Linear Reference System (e.g., Route-beginning milepoint, Route-ending 

milepoint) or to a spatial data system (i.e., longitude/latitude for begin and end points). Street address 

could also possibly be used for urban areas. The descriptor types used must be common across all 

MIRE files and compatible with crash data location coding. 

Begin Point Segment Descriptor (10)

Source: FHWA
FHWA MIRE FDE

17

NON-LOCAL PAVED ROADS

Roadway Segment

Definition: Location information defining the end of the segment.

Recommended Attributes: End point will be defined by the user agency. Generally, this will be 

based on homogeneity of chosen attributes throughout the segment). End point segment descriptors 

can be either linked to a Linear Reference System (e.g., Route-beginning milepoint, Route-ending 

milepoint) or to a spatial data system (i.e., longitude/latitude for begin and end points). Street address 

could also possibly be used for urban areas. The descriptor types used must be common across all 

MIRE files and compatible with crash data location coding. 

End Point Segment Descriptor (11)

Source: FHWA
FHWA MIRE FDE

18

NON-LOCAL PAVED ROADS

Roadway Segment

Definition: The length of the segment. 

Recommended Attributes: Miles. 

Segment Length (13)

Source: FHWA
FHWA MIRE FDE

19

NON-LOCAL PAVED ROADS

Roadway Segment

Definition: Direction of inventory if divided roads are inventoried in each direction.

Recommended Attributes: 

1. Predominate compass direction (e.g. North, South, East, West) – if roads are inventoried in each 

direction usually due to different characteristics on each roadway.

2. Both – if inventoried in only one direction (e.g. the inventory applies to both directions of a 

single-carriageway roadway).

Direction of Inventory (18)

Source: FHWA
FHWA MIRE FDE

20

NON-LOCAL PAVED ROADS

Roadway Segment

Definition: The FHWA approved Functional Classification System.

Recommended Attributes: 

1. Interstate.

2. Principal arterial other freeways and expressways.

3. Principal arterial other.

4. Minor arterial.

5. Major collector.

6. Minor collector.

7. Local.

Note: This element has been changed since MIRE 1.0.

Functional Class (19)

Source: FHWA
FHWA MIRE FDE

21

NON-LOCAL PAVED ROADS

Roadway Segment

Definition: The type of median present on the segment.

Recommended Attributes: 

1. Undivided. 

2. Flush paved median (at least 4 ft in width). 

3. Raised median. 

4. Depressed median. 

5. Two-way left-turn lane. 

6. Railroad or rapid transit. 

7. Divided, separate grades without retaining wall.

8. Divided, separate grades with retaining wall. 

9. Other divided. 

Median Type (55)

Source: FHWA
FHWA MIRE FDE

22

NON-LOCAL PAVED ROADS

Roadway Segment

Access Control (23)

Definition: The degree of access control for a given section of road.

Recommended Attributes: 

1. Full access control – Preference given to through 

traffic movements by providing interchanges with 

selected public roads, and by prohibiting crossing 

at-grade and direct driveway connections (i.e., 

limited access to the facility). 

2. Partial access control - Preference given 

to through traffic movement. In addition to 

interchanges, there may be some crossings 

at-grade with public roads, but, direct private 

driveway connections have been minimized 

through the use of frontage roads or other local 

access restrictions. Control of curb cuts is not 

access control. 

3. No access control - No degree of access control 

exists (i.e., full access to the facility is permitted). 

Note: The definition of this element has been 

changed since MIRE 1.0. 

Source: FHWA
FHWA MIRE FDE

23

NON-LOCAL PAVED ROADS

Roadway Segment

Definition: Indication of whether the segment operates as a one- or two-way roadway.

Recommended Attributes: 

1. One-way. 

2. Two-way. 

3. One direction of travel for divided roadways.

One/Two-Way Operations (93)

Source: FHWA
FHWA MIRE FDE

24

NON-LOCAL PAVED ROADS

Roadway Segment

Definition: The total number of through lanes on the segment. It is the number of through lanes in the direction of 

inventory. If the road is inventoried in both directions together, this would be the number of through lanes in both 

directions. If the road is inventoried separately for each direction, this would be the number of through lanes in one 

single direction. 

This excludes auxiliary lanes, such as collector-distributor lanes, weaving lanes, frontage road lanes, parking and 

turning lanes, acceleration/deceleration lanes, toll collection lanes, high-occupancy vehicle (HOV) lanes, 

high-occupancy Toll (HOT) lanes, transit lanes, shoulders, and truck climbing lanes. These types of auxiliary lanes 

are captured in separate elements. 

Recommended Attributes: Numeric.

Note: This element has been changed since MIRE 1.0.

Number of Through Lanes (32)

Source: FHWA
FHWA MIRE FDE

25

NON-LOCAL PAVED ROADS

Roadway Segment

Definition: AADT value to represent the current data year. For two-way facilities, provide the 

AADT for both directions; provide the directional AADT if part of a one-way couplet or for oneway streets.

Recommended Attributes: Vehicles per day.

Annual Average Daily Traffic (AADT) (81)

Source: FHWA
FHWA MIRE FDE

26

NON-LOCAL PAVED ROADS

Roadway Segment

Definition: Year of AADT.

Recommended Attributes: Year.

AADT Year (82)

Source: FHWA
FHWA MIRE FDE

27

NON-LOCAL PAVED ROADS

Roadway Segment

Definition: The entity that has legal ownership of a roadway. 

Recommended Attributes: 

1. State Highway Agency.

2. County Highway 

Agency. 

3. Town or Township 

Highway Agency. 

4. City or Municipal 

Highway Agency. 

5. State Park, Forest, or 

Reservation Agency. 

6. Local Park, Forest, or 

Reservation Agency. 

7. Other State Agency. 

8. Other Local Agency. 

9. Private (other than 

Railroad). 

10. Railroad. 

11. State Toll Authority. 

12. Local Toll Authority. 

13. Other Public 

Instrumentality 

(e.g. Airport). 

14. Indian Tribe Nation. 

15. Other Federal Agency.

16. Bureau of Indian 

Affairs. 

17. Bureau of Fish and 

Wildlife. 

18. U.S. Forest Service. 

19. National Park Service.

20. Tennessee Valley 

Authority. 

21. Bureau of Land 

Management. 

22. Bureau of 

Reclamation. 

23. Corps of Engineers. 

24. Air Force. 

25. Navy/Marines.

26. Army. 

27. Other.

Type of Governmental Ownership (4) 

Source: FHWA
28

NON-LOCAL PAVED ROADS

Intersection

FHWA MIRE FDE
FHWA MIRE FDE

29

NON-LOCAL PAVED ROADS

Intersection

Definition: A unique junction identifier.

Recommended Attributes: User defined (e.g., node number, LRS of primary route, etc.).

Unique Junction Identifier (110)

Source: FHWA
FHWA MIRE FDE

30

NON-LOCAL PAVED ROADS

Intersection

Definition: Location of the center of the junction on the first intersecting route (e.g. route milepost). 

Note that if the Junction File is a spatial data file, this would be the coordinates and would be the 

same for all crossing roads.

Recommended Attributes: Route and location descriptors (e.g., route and milepoint or 

route and spatial coordinates). 

Note: Must be consistent with other MIRE files for linkage. 

Location Identifier for Road 1 Crossing Point (112)

Source: FHWA
FHWA MIRE FDE

31

NON-LOCAL PAVED ROADS

Intersection

Definition: Location of the center of the junction on the second intersecting route (e.g. route-milepost). Note 

that in a spatial data system, this would be the same as Element 112. Location Identifier for Road 1 Crossing 

Point. Not applicable if intersecting route is not an inventoried road (i.e., a railroad or bicycle path).

Recommended Attributes: Route and location descriptors (e.g., route and milepoint or 

route and spatial coordinates). 

Note: Must be consistent with other MIRE files for linkage. 

Location Identifier for Road 2 Crossing Point (113)

Source: FHWA
FHWA MIRE FDE

32

NON-LOCAL PAVED ROADS

Intersection

Definition: The type of geometric configuration that best describes the intersection/junction.

Recommended Attributes: 

1. T-Intersection. 

2. Y-Intersection. 

3. Cross-Intersection (four legs). 

4. Five or more legs and not circular. 

5. Roundabout.

6. Other circular intersection (e.g., 

rotaries, neighborhood traffic circles). 

7. Midblock pedestrian crossing. 

8. Restricted crossing U-turn 

(i.e., RCUT, J-turn, Superstreet) 

intersection. 

9. Median U-turn (i.e., MUT, Michigan 

Left, Thru-turn) intersection.

10. Displaced left-turn (i.e., DLT, 

continuous flow (CFI)) intersection. 

11. Jughandle (i.e., New Jersey

jughandle) intersection. 

12. Continuous green T intersection.

13. Quadrant (i.e., quadrant roadway) 

intersection. 

14. Other. 

Note: This element has been changed 

since MIRE 1.0. In MIRE 1.0, this 

element has 8 attributes. In MIRE 2.0 

this element has 14 attributes.

Intersection/Junction Geometry (116)

Source: FHWA
FHWA MIRE FDE

33

NON-LOCAL PAVED ROADS

Intersection

Definition: Traffic control present at intersection/junction.

Recommended Attributes: 

1. Uncontrolled. 

2. Two-way stop. 

3. All-way stop.

4. Yield sign. 

5. Signalized.

6. Pedestrian Hybrid Beacon (PHB 

or High-Intensity Activated 

Crosswalk [HAWK]). 

7. Flash Beacon (include 

Rectangular Rapid Flash 

Beacon). 

8. Railroad crossing, gates and 

flashing lights. 

9. Railroad crossing, flashing lights 

only. 

10. Railroad crossing, stop-sign 

controlled. 

11. Railroad crossing, crossbucks 

only. 

12. Other. 

Note: This element has been 

changed since MIRE 1.0. In MIRE 

1.0, there are 11 attributes. In 

MIRE 2.0, there are 12 attributes 

with more detail regarding type of 

signalization.

Intersection/Junction Traffic Control (121)

Source: FHWA
FHWA MIRE FDE

34

NON-LOCAL PAVED ROADS

Intersection

Definition: The AADT on the approach leg of the intersection/junction.

Recommended Attributes: Vehicles per day.

Approach AADT (130) [for Each Intersecting Road]

Source: FHWA
FHWA MIRE FDE

35

NON-LOCAL PAVED ROADS

Intersection

Definition: The year of the AADT on the approach leg of the intersection/junction.

Recommended Attributes: Year. 

Approach AADT Year (131) [for Each Intersecting Road]

Source: FHWA
FHWA MIRE FDE

36

NON-LOCAL PAVED ROADS

Intersection

Definition: A unique identifier for each approach of an intersection.

Recommended Attributes: Any identifier that is unique for each approach within a single intersection (e.g., 

sequential numbers or letters, compass directions, “clock hours”). 

Unique Approach Identifier (129)

Source: FHWA
37

NON-LOCAL PAVED ROADS

Intersection: Circular

FHWA MIRE FDE
FHWA MIRE FDE

38

NON-LOCAL PAVED ROADS

Intersection: Circular

Definition: A unique junction identifier.

Recommended Attributes: User defined (e.g., node number, LRS of primary route, etc.).

Unique Junction Identifier (110)

Source: FHWA
FHWA MIRE FDE

39

NON-LOCAL PAVED ROADS

Intersection: Circular

Definition: Location of the center of the junction on the first intersecting route (e.g. route-milepost). 

Note that if the Junction File is a spatial data file, this would be the coordinates and would be the 

same for all crossing roads.

Recommended Attributes: Route and location descriptors (e.g., route and milepoint or 

route and spatial coordinates). 

Note: Must be consistent with other MIRE files for linkage. 

Location Identifier for Road 1 Crossing Point (112)

Source: FHWA
FHWA MIRE FDE

40

NON-LOCAL PAVED ROADS

Intersection: Circular

Definition: Location of the center of the junction on the second intersecting route (e.g. route-milepost). Note 

that in a spatial data system, this would be the same as Element 112. Location Identifier for Road 1 Crossing 

Point. Not applicable if intersecting route is not an inventoried road (i.e., a railroad or bicycle path).

Recommended Attributes: Route and location descriptors (e.g., route and milepoint or 

route and spatial coordinates). 

Note: Must be consistent with other MIRE files for linkage. 

Location Identifier for Road 2 Crossing Point (113)

Source: FHWA
FHWA MIRE FDE

41

NON-LOCAL PAVED ROADS

Intersection: Circular

Definition: The type of geometric configuration that best describes the intersection/junction.

Recommended Attributes: 

1. T-Intersection. 

2. Y-Intersection. 

3. Cross-Intersection (four legs). 

4. Five or more legs and not 

circular. 

5. Roundabout.

6. Other circular intersection (e.g., 

rotaries, neighborhood traffic 

circles). 

7. Midblock pedestrian crossing. 

8. Restricted crossing U-turn 

(i.e., RCUT, J-turn, Superstreet) 

intersection. 

9. Median U-turn (i.e., MUT, 

Michigan Left, Thru-turn) 

intersection.

10. Displaced left-turn (i.e., DLT, 

CFI) intersection. 

11. Jughandle (i.e., New Jersey 

jughandle) intersection. 

12. Continuous green T intersection. 

13. Quadrant (i.e., quadrant 

roadway) intersection. 

14. Other. 

Note: In MIRE 1.0, this element 

has 8 attributes. In MIRE 2.0 this 

element has 14 attributes.

Intersection/Junction Geometry (116)

Source: FHWA
FHWA MIRE FDE

42

NON-LOCAL PAVED ROADS

Intersection: Circular

Definition: Traffic control present at intersection/junction.

Recommended Attributes: 

1. Uncontrolled. 

2. Two-way stop. 

3. All-way stop.

4. Yield sign. 

5. Signalized.

6. Pedestrian Hybrid Beacon (PHB 

or High-Intensity Activated 

Crosswalk [HAWK]). 

7. Flash Beacon (include 

Rectangular Rapid Flash 

Beacon). 

8. Railroad crossing, gates and 

flashing lights. 

9. Railroad crossing, flashing lights 

only. 

10. Railroad crossing, stop-sign 

controlled. 

11. Railroad crossing, crossbucks 

only. 

12. Other. 

Note: This element has been 

changed since MIRE 1.0. In MIRE 

1.0, there are 11 attributes. In 

MIRE 2.0, there are 12 attributes 

with more detail regarding type of 

signalization.

Intersection/Junction Traffic Control (121)

Source: FHWA
FHWA MIRE FDE

43

NON-LOCAL PAVED ROADS

Intersection: Circular

Definition: The AADT on the approach leg of the intersection/junction.

Recommended Attributes: Vehicles per day.

Approach AADT (130) [for Each Intersecting Road]

Source: FHWA
FHWA MIRE FDE

44

NON-LOCAL PAVED ROADS

Intersection: Circular

Definition: The year of the AADT on the approach leg of the intersection/junction.

Recommended Attributes: Year. 

Approach AADT Year (131) [for Each Intersecting Road]

Source: FHWA
FHWA MIRE FDE

45

NON-LOCAL PAVED ROADS

Intersection: Circular

Definition: A unique identifier for each approach of an intersection.

Recommended Attributes: Any identifier that is unique for each approach within a single intersection (e.g., 

sequential numbers or letters, compass directions, “clock hours”). 

Unique Approach Identifier (129)

Source: FHWA
46

NON-LOCAL PAVED ROADS

Interchange/Ramp

FHWA MIRE FDE
FHWA MIRE FDE

47

NON-LOCAL PAVED ROADS

Interchange/Ramp

Definition: A unique identifier for each interchange.

Recommended Attributes: User defined (e.g., node number, LRS of primary route, exit numbers, etc.).

Unique Interchange Identifier (168)

Source: FHWA
FHWA MIRE FDE

48

NON-LOCAL PAVED ROADS

Interchange/Ramp

Definition: Location on the roadway at the beginning ramp terminal (e.g. route-milepost for that roadway) if 

the ramp connects with a roadway at that point.

Recommended Attributes: Route and location descriptors (e.g., route and milepoint or spatial coordinates) 

for the roadway intersected at the beginning ramp terminal. Must be consistent with other MIRE files for linkage. 

Location Identifier for Roadway at Beginning Ramp Terminal (187)

Source: FHWA
FHWA MIRE FDE

49

NON-LOCAL PAVED ROADS

Interchange/Ramp

Definition: Location on the roadway at the ending ramp terminal (e.g. route-milepost for that roadway) if the 

ramp connects with a roadway at that point.

Recommended Attributes: Route and location descriptors (e.g., route and milepoint or spatial coordinates) 

for the roadway intersected at the ending ramp terminal. Must be consistent with other MIRE files for linkage. 

Location Identifier for Roadway at Ending Ramp Terminal (191)

Source: FHWA
FHWA MIRE FDE

50

NON-LOCAL PAVED ROADS

Interchange/Ramp

Definition: Length of ramp. The length should be measured from taper to taper.

Recommended Attributes: Feet.

Note: This element has been changed since MIRE 1.0.

Ramp Length (177)

Source: FHWA
FHWA MIRE FDE

51

NON-LOCAL PAVED ROADS

Interchange/Ramp

Definition: A ramp is described by a beginning and ending ramp terminal in the direction of ramp traffic flow 

or the direction of inventory. This element describes the type of roadway intersecting with the ramp at the 

beginning terminal.

Recommended Attributes: 

1. Freeway.

2. Non-freeway (surface street).

3. Other Ramp.

4. Frontage road.

5. Other.

Roadway Type at Beginning Ramp Terminal (185)

Source: FHWA
FHWA MIRE FDE

52

NON-LOCAL PAVED ROADS

Interchange/Ramp

Definition: A ramp is described by a beginning and ending ramp terminal in the direction of inventory. This 

element describes the type of roadway intersecting with the ramp at the ending terminal.

Recommended Attributes: 

1. Freeway. 

2. Non-freeway (surface street). 

3. Other Ramp.

4. Frontage road. 

5. Other.

Roadway Type at Ending Ramp Terminal (189)

Source: FHWA
FHWA MIRE FDE

53

NON-LOCAL PAVED ROADS

Interchange/Ramp

Definition: Type of interchange.

Recommended Attributes: 

1. Diamond.

2. Full cloverleaf.

3. Partial cloverleaf.

4. Trumpet. 

5. Three-leg directional. 

6. Four-leg all-directional. 

7. Semi-directional. 

8. Single entrances and/or exits 

(partial interchange). 

9. Single point interchange (SPI). 

10. Diverging diamond (i.e., DDI,

double-crossover diamond 

DCD) interchange. 

11. Double roundabout (i.e., double 

raindrop) interchange. 

12. Single roundabout (i.e., single 

raindrop) interchange. 

13. Quadrant .

14. Other.

Note: This element has been 

changed since MIRE 1.0. 

Additional interchange types have 

been added to the attributes in 

MIRE 2.0.

Interchange Type (172)

Source: FHWA
FHWA MIRE FDE

54

NON-LOCAL PAVED ROADS

Interchange/Ramp

Definition: AADT on ramp.

Recommended Attributes: Numeric.

Ramp AADT (181)

Source: FHWA
FHWA MIRE FDE

55

NON-LOCAL PAVED ROADS

Interchange/Ramp

Definition: Year of AADT on ramp.

Recommended Attributes: Year.

Year of Ramp AADT (182)

Source: FHWA
FHWA MIRE FDE

56

NON-LOCAL PAVED ROADS

Interchange/Ramp

Definition: The FHWA approved Functional Classification System.

Recommended Attributes: 

1. Interstate.

2. Principal arterial other freeways 

and expressways.

3. Principal arterial other.

4. Minor arterial.

5. Major collector.

6. Minor collector.

7. Local.

Note: This element has been 

changed since MIRE 1.0.

Functional Class (19)

Source: FHWA
FHWA MIRE FDE

57

NON-LOCAL PAVED ROADS

Interchange/Ramp

Type of Governmental Ownership (4)

Definition: The entity that has legal ownership of a roadway. 

Recommended Attributes: 

1. State Highway Agency.

2. County Highway 

Agency. 

3. Town or Township 

Highway Agency. 

4. City or Municipal 

Highway Agency. 

5. State Park, Forest, or 

Reservation Agency. 

6. Local Park, Forest, or 

Reservation Agency. 

7. Other State Agency. 

8. Other Local Agency. 

9. Private (other than 

Railroad). 

10. Railroad. 

11. State Toll Authority. 

12. Local Toll Authority. 

13. Other Public 

Instrumentality 

(e.g. Airport). 

14. Indian Tribe Nation. 

15. Other Federal Agency. 

16. Bureau of Indian 

Affairs. 

17. Bureau of Fish and 

Wildlife. 

18. U.S. Forest Service. 

19. National Park Service.

20. Tennessee Valley 

Authority. 

21. Bureau of Land 

Management. 

22. Bureau of 

Reclamation. 

23. Corps of Engineers. 

24. Air Force. 

25. Navy/Marines.

26. Army. 

27. Other.

Source: FHWA
58

LOCAL PAVED ROADS

Roadway Segment

FHWA MIRE FDE
FHWA MIRE FDE

59

LOCAL PAVED ROADS

Roadway Segment

Definition: Unique segment identifier.

Recommended Attributes: Derived from other elements (e.g., combination of route number, county location

and beginning and ending milepoints). 

Segment Identifier (12) 

Source: FHWA
FHWA MIRE FDE

60

LOCAL PAVED ROADS

Roadway Segment

Definition: The FHWA approved Functional Classification System.

Recommended Attributes: 

1. Interstate.

2. Principal arterial other freeways 

and expressways.

3. Principal arterial other.

4. Minor arterial.

5. Major collector.

6. Minor collector.

7. Local.

Note: This element has been 

changed since MIRE 1.0.

Functional Class (19)

Source: FHWA
FHWA MIRE FDE

61

LOCAL PAVED ROADS

Roadway Segment

Surface Type (24) 

Definition: The surface type of the segment.

Recommended Attributes: 

1. Unpaved. 

a. Dirt. b. Gravel. c. Other. 

2. Bituminous. 

3. Jointed Plain Concrete 

Pavement (JPCP). 

4. Jointed Reinforced 

Concrete Pavement 

(JRCP). 

5. Continuously 

Reinforced Concrete 

Pavement (CRCP). 

6. Asphalt-Concrete (AC) 

Overlay over Existing 

AC Pavement. 

7. AC Overlay over 

Existing Jointed 

Concrete Pavement. 

8. AC (Bi Overlay over 

Existing CRCP). 

9. Unbonded Jointed 

Concrete Overlay 

on Portland Cement 

Concrete (PCC) 

Pavements. 

10. Unbonded CRCP 

Overlay on PCC 

Pavements. 

11. Bonded PCC Overlays 

on PCC Pavements. 

12. Other. 

Note: This element 

has been changed 

since MIRE 1.0. To 

facilitate safety 

analyses, it is 

recommended that 

the type of surface for 

unpaved roads be more 

specifically identified.

Source: FHWA
FHWA MIRE FDE

62

LOCAL PAVED ROADS

Roadway Segment

Type of Governmental Ownership (4)

Definition: The entity that has legal ownership of a roadway. 

Recommended Attributes: 

1. State Highway Agency.

2. County Highway 

Agency. 

3. Town or Township 

Highway Agency. 

4. City or Municipal 

Highway Agency. 

5. State Park, Forest, or 

Reservation Agency. 

6. Local Park, Forest, or 

Reservation Agency. 

7. Other State Agency. 

8. Other Local Agency. 

9. Private (other than 

Railroad). 

10. Railroad. 

11. State Toll Authority. 

12. Local Toll Authority. 

13. Other Public 

Instrumentality 

(e.g. Airport). 

14. Indian Tribe Nation. 

15. Other Federal Agency. 

16. Bureau of Indian 

Affairs. 

17. Bureau of Fish and 

Wildlife. 

18. U.S. Forest Service. 

19. National Park Service.

20. Tennessee Valley 

Authority. 

21. Bureau of Land 

Management. 

22. Bureau of 

Reclamation. 

23. Corps of Engineers. 

24. Air Force. 

25. Navy/Marines.

26. Army. 

27. Other.

Source: FHWA
FHWA MIRE FDE

63

LOCAL PAVED ROADS

Roadway Segment

Number of Through Lanes (32) 

Definition: The total number of through lanes on the segment. It is the number of through lanes in the direction 

of inventory. If the road is inventoried in both directions together, this would be the number of through lanes in 

both directions. If the road is inventoried separately for each direction, this would be the number of through lanes 

in one single direction. 

This excludes auxiliary lanes, such as collector-distributor lanes, weaving lanes, frontage road lanes, parking 

and turning lanes, acceleration/deceleration lanes, toll collection lanes, HOV lanes, HOT lanes, transit lanes, 

shoulders, and truck climbing lanes. These types of auxiliary lanes are captured in 

separate elements.

Recommended Attributes: Numeric.

Note: This element has been changed since MIRE 1.0.

Source: FHWA
FHWA MIRE FDE

64

LOCAL PAVED ROADS

Roadway Segment

Definition: The FHWA approved Functional Classification System.

Recommended Attributes: 

1. Interstate.

2. Principal arterial other freeways 

and expressways.

3. Principal arterial other.

4. Minor arterial.

5. Major collector.

6. Minor collector.

7. Local.

Note: This element has been 

changed since MIRE 1.0.

Annual Average Daily Traffic (81) 

Source: FHWA
FHWA MIRE FDE

65

LOCAL PAVED ROADS

Roadway Segment

Definition: Location information defining the beginning of the segment.

Recommended Attributes: Begin point will be defined by the user agency. Generally, this will be 

based on homogeneity of chosen attributes throughout the segment. Begin point segment descriptors 

can be either linked to a Linear Reference System (e.g., Route-beginning milepoint, Route-ending 

milepoint) or to a spatial data system (i.e., longitude/latitude for begin and end points). Street address 

could also possibly be used for urban areas. The descriptor types used must be common across all 

MIRE files and compatible with crash data location coding.

Begin Point Segment Descriptor (10) 

Source: FHWA
FHWA MIRE FDE

66

LOCAL PAVED ROADS

Roadway Segment

Definition: Location information defining the end of the segment.

Recommended Attributes: End point will be defined by the user agency. Generally, this will be based 

on homogeneity of chosen attributes throughout the segment). End point segment descriptors can be 

either linked to a Linear Reference System (e.g., Route-beginning milepoint, Route-ending milepoint) 

or to a spatial data system (i.e., longitude/latitude for begin and end points). Street address could also 

possibly be used for urban areas. The descriptor types used must be common across all MIRE files and 

compatible with crash data location coding. 

End Point Segment Descriptor (11) 

Source: FHWA
FHWA MIRE FDE

67

LOCAL PAVED ROADS

Roadway Segment

Definition: The rural or urban designation based on Census urban boundary and population.

Recommended Attributes: 

1. Rural.

2. Urban (population > 5,000).

Rural/Urban Designation (20)

Source: FHWA
68

UNPAVED ROADS

Roadway Segment

FHWA MIRE FDE
FHWA MIRE FDE

69

UNPAVED ROADS

Roadway Segment

Definition: Unique segment identifier.

Recommended Attributes: Derived from other elements (e.g., combination of route number, 

county location and beginning and ending milepoints). 

Segment Identifier (12) 

Source: FHWA
FHWA MIRE FDE

70

UNPAVED ROADS

Roadway Segment

Definition: The FHWA approved Functional Classification System.

Recommended Attributes: 

1. Interstate.

2. Principal arterial other freeways 

and expressways.

3. Principal arterial other.

4. Minor arterial.

5. Major collector.

6. Minor collector.

7. Local.

Note: This element has been 

changed since MIRE 1.0.

Functional Class (19)

Source: FHWA
FHWA MIRE FDE

71

UNPAVED ROADS

Roadway Segment

Definition: The entity that has legal ownership of a roadway. 

Recommended Attributes: 

1. State Highway Agency.

2. County Highway 

Agency. 

3. Town or Township 

Highway Agency. 

4. City or Municipal 

Highway Agency. 

5. State Park, Forest, or 

Reservation Agency. 

6. Local Park, Forest, or 

Reservation Agency. 

7. Other State Agency. 

8. Other Local Agency. 

9. Private (other than 

Railroad). 

10. Railroad. 

11. State Toll Authority. 

12. Local Toll Authority. 

13. Other Public 

Instrumentality 

(e.g. Airport). 

14. Indian Tribe Nation. 

15. Other Federal Agency. 

16. Bureau of Indian 

Affairs. 

17. Bureau of Fish and 

Wildlife. 

18. U.S. Forest Service. 

19. National Park Service.

20. Tennessee Valley 

Authority. 

21. Bureau of Land 

Management. 

22. Bureau of 

Reclamation. 

23. Corps of Engineers. 

24. Air Force. 

25. Navy/Marines.

26. Army. 

27. Other.

Type of Governmental Ownership (4) 

Source: FHWA
FHWA MIRE FDE

72

UNPAVED ROADS

Roadway Segment

Definition: Location information defining the beginning of the segment. 

Recommended Attributes: Begin point will be defined by the user agency. Generally, this will be 

based on homogeneity of chosen attributes throughout the segment. Begin point segment descriptors 

can be either linked to a Linear Reference System (e.g., Route-beginning milepoint, Route-ending 

milepoint) or to a spatial data system (i.e., longitude/latitude for begin and end points). Street address 

could also possibly be used for urban areas. The descriptor types used must be common across all 

MIRE files and compatible with crash data location coding. 

Begin Point Segment Descriptor (10)

Source: FHWA
FHWA MIRE FDE

73

UNPAVED ROADS

Roadway Segment

Definition: Location information defining the end of the segment.

Recommended Attributes: End point will be defined by the user agency. Generally, this will be 

based on homogeneity of chosen attributes throughout the segment). End point segment descriptors 

can be either linked to a Linear Reference System (e.g., Route-beginning milepoint, Route-ending 

milepoint) or to a spatial data system (i.e., longitude/latitude for begin and end points). Street address 

could also possibly be used for urban areas. The descriptor types used must be common across all 

MIRE files and compatible with crash data location coding. 

End Point Segment Descriptor (11)

Source: FHWA
FHWA-SA-22-058