ADOT 2024 Average Annual Daily Traffic (AADT)

The Annual Average Daily Traffic (AADT) for sections of roads for all vehicle types, including single and combination trucks, reported in the 2024 Highway Performance Monitoring System (HPMS) federal report. Annual Average Daily Traffic (AADT) is used to represent 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. Single unit trucks are any trucks that meets the requirements established for the FHWA Truck Classification Method for Categories 4 through 7. Combination unit trucks are any trucks that meets the requirements established for the FHWA Truck Classification Method for Categories 8 through 13. Refer to the Federal Highway Administration website for more information about truck classifications. 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.本数据集收录了2024年公路性能监测系统（Highway Performance Monitoring System, HPMS）联邦报告中发布的各类车型路段年平均日交通量（Annual Average Daily Traffic, AADT）数据，涵盖车型包括单式卡车与组合式卡车。年平均日交通量用于表征年度典型单日的车流量，在道路规划工作中具备重要价值，例如用于确定道路的联邦功能分类。该数据通过各类交通计数设备采集所得，包括自动交通记录仪（Automatic Traffic Recorders, ATR）、动态称重（Weigh In Motion, WIM）设备以及基于管道的短期计数器。将全年采集的全部有效交通数据求和后除以365，即可计算得到年平均日交通量。单式卡车指符合美国联邦公路管理局（Federal Highway Administration, FHWA）卡车分类方法第4至7类标准的所有车辆；组合式卡车则指符合该分类方法第8至13类标准的所有车辆。如需了解更多卡车分类相关信息，请查阅美国联邦公路管理局官方网站。本报告的覆盖范围包括：州级公路系统（即所有由ADOT管辖的道路）、国家公路系统（National Highway System, NHS）以及所有符合联邦援助资格的道路。符合联邦援助资格的道路具体包括：等级为次要集散路及以上的城市道路（功能系统1-6），以及等级为主要集散路及以上的乡村道路（功能系统1-5）。对于配备自动交通记录仪的道路，交通数据每年更新一次。对于需使用短期计数器的道路，国家公路系统所有路段、州际公路（功能系统1）、主要干线道路（功能系统2-3）以及样本面板路段的交通数据每三年采集一次；其余符合联邦援助资格的道路（包括次要干线道路与集散道路）则每六年采集一次。在单向道路及匝道上，年平均日交通量代表单方向的车流量；在双向道路上，年平均日交通量仅按里程桩号递增的主方向报告，且代表该主方向与非主方向的总车流量。注：主方向指里程桩号递增的行车方向。