Name: AADT_SingleUnitTrucks_2023

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Description: <p>The Annual Average Daily Traffic (AADT) for sections of roads for Single Unit trucks reported in the 2023 Highway Performance Monitoring System (HPMS) federal report. Annual Average Daily Traffic (AADT) is used to represent single unit truck traffic on a typical day of the year and is important for planning purposes, such as defining the federal functional classification of a roadway. The values are calculated using data collected from traffic counter devices, such as Automatic Traffic Recorders (ATR), Weigh In Motion (WIM) devices, and short term counters using tubes. All available single unit truck traffic data collected throughout the year are then summed and divided by 365 to calculate the annual average daily traffic. Single unit trucks are any trucks that meets the requirements established for the FHWA Truck Classification Method for Categories 4 through 7. Refer to the Federal Highway Administration website for more information about <a href="https://www.fhwa.dot.gov/policyinformation/tmguide/tmg_2013/vehicle-types.cfm" target="_blank">truck classifications</a>. <br /><br /><b>Reported Extent:</b> State Highway System (i.e. all ADOT-owned roads), National Highway System (NHS), and all federal aid-eligible roads. Federal aid-eligible roads include urban roads classified as minor collectors or above (functional system 1-6) and rural roads classified as major collectors or above (function system 1-5). Roads where ATRs are available, counts are updated annually. For roads where short term counters must be used, traffic counts are collected every three years for all National Highway System (NHS) roads as well as interstates (functional system 1), principal arterials (functional systems 2-3), and sample panel sections. All other federal aid-eligible roads, including minor arterials and collectors, are collected every six years. For undivided highways, which do not have a physical barrier between the two directions of traffic, values are reported as the sum total for both directions of travel. On divided highways, AADT is reported separately on the cardinal and non-cardinal directions of the roadway. Note, the cardinal direction refers to the direction of increasing mileposts.<br /><br /><b>Key Terms:</b><br />ADOT, MPD, 2023, HPMS, 2023 HPMS, Traffic Volume, Traffic Count</p>

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Last Edit Date: 9/22/2025 10:14:54 PM

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