# Traffic Data

# Examples

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| **4R Examples**                                                       |
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| A traffic study was prepared for the FHWA in 1993 by RUST Environment |
| & Infrastructure.                                                     |
|                                                                       |
| The 1993 Annual Average Daily Traffic (AADT) was 230 vpd, and the     |
| Seasonal Average Daily Traffic was 318 vpd, with 3% truck traffic and |
| a 50% directional split. Based on historical trip generation rates    |
| and the projected population growth, the study projects an AADT of    |
| 2088 and SADT of 2873 for the year 2015.                              |
|                                                                       |
| Based on the above recommendations, by year 2006, AADT volumes should |
| be approximately 880 vpd, with 5,438 vpd being projected to year      |
| 2026. Field observation indicate traffic volumes to be much lower     |
| than projected. Traffic counters will be placed along the route, and  |
| the data will be re-anaylzed by the FHWA.                             |
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| A traffic analysis technical memorandum was prepared in February      |
| 2003. Traffic counts were made for one week in October 2002 for each  |
| route segment. The traffic mix for Hyampom road mostly consists of    |
| passenger cars with one school bus each weekday in each direction and |
| a small mixture of light to heavy trucks. When logging operations     |
| occur, primarily during the summer months, log trucks dominate the    |
| heavy vehicles.                                                       |
|                                                                       |
| Projections for ADTs were made for the year 2028 using a 1 percent    |
| annual growth rate. The original traffic counts for segments 4 and 5  |
| were 144. The design ADT for the year 2028 is 176. It was assumed in  |
| the mix of vehicles that 10 percent were mixed trucks and the truck   |
| mix would consist of 45 percent logging trucks, 25 percent 3-axle     |
| trucks with the remainder split between buses and two-axle trucks.    |
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| The 2003 Sequoia/Kings Canyon National Park Traffic Data Package      |
| showed existing traffic of 686 AADT. Using a 3% growth rate, the 2008 |
| AADT would be 795 and the 2028 AADT would be 1435. Approximately 5%   |
| of the traffic is trucks.                                             |
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| **3R Examples**                                                       |
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| Traffic counters have been set out on the project and data should be  |
| back in August 2003. Traffic projection rate will be based on the     |
| park's entrance station data.                                         |
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| The 2005 traffic data for the project was provided by the National    |
| Park Service and is also shown in the environmental assessment        |
| document on page III-14. No long-term historical data was available,  |
| so the 2025 were calculated based on a conservative growth rate of    |
| 10% and rounded to nearest 5-vehicle increment.                       |
|                                                                       |
| ADT (2005) 135                                                        |
|                                                                       |
| ADT (2025) 150                                                        |
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| Traffic data was collected from the NPS Traffic Monitoring Program,   |
| Coverage Count and Data Reporting Project. The 2003 Annual Average    |
| Daily Traffic (AADT) was 109 vpd, and the Seasonal Average Daily      |
| Traffic (SADT) was 173 vpd, with 1.5% truck traffic and a 50%         |
| directional split. Based on historical trip generation rates and the  |
| projected population growth, the study projects an AADT of 315 for    |
| the year 2024.                                                        |
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