Name: AADT_2024

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Description:

The Annual Average Daily Traffic (AADT) for sections of roads for all vehicle types reported in the 2024 Highway Performance Monitoring System (HPMS) federal report.

Annual Average Daily Traffic (AADT) is used to represent all vehicle 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 traffic data collected throughout the year are then summed and divided by 365 to calculate the annual average daily traffic.

Reported Extent: 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.

On one-way roadways and ramps, the AADT represents the single-direction of traffic. For two-way roadways, AADT is reported only on the cardinal direction of the roadway and represents the total traffic for both the cardinal and non-cardinal directions of travel. Note, the cardinal direction refers to the direction of increasing mileposts.

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Last Edit Date: 11/22/2025 9:27:00 PM

Schema Last Edit Date: 9/26/2025 7:17:20 PM

Data Last Edit Date: 9/26/2025 3:40:52 PM

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