The Utah Department of Transportation (UDOT), maintains a database of observed average annual daily traffic (AADT) volumes for major streets and highways throughout the state. This data can be accessed via the link located in the “Helpful Links and Downloads” section.
The Wasatch Front Regional Council’s (WFRC) preliminary forecasted traffic volumes through the year 2050 in the Ogden-Layton and Salt Lake-West Valley urbanized areas can be found via the Utah Statewide Annual Average Daily Traffic (AADT) – Historic & Forecast web map. The ‘Advanced Version’ view of the web map includes the population and employment forecasts in addition to the Regional Transportation Plan projects through 2050 for reference.
The expected margin of error for the values shown on the map, which depends on the magnitude of the volume, range from 10 to 20 percent. These ranges are generally based on acceptable confidence intervals found in the Federal Highway Administration’s (FHWA) Model Validation and Reasonableness Checking Manual. For environmental studies or alternatives analysis, WFRC recommends using the travel model directly, but still tempering results by observed values, so that appropriate comparisons can be made among alternatives. The forecasts found on the website generally assume completion of the current WFRC Regional Transportation Plan (RTP). WFRC assumes no liability for others’ use of these traffic forecasts, including both the individual values and ranges of values obtained from the margins of error.
For additional information regarding traffic data, please contact Suzie Swim.