Traffic Volumes 2025

The Annual Average Daily Traffic (AADT) is the estimated mean daily traffic volume and the Commercial Annual Average Daily Traffic (CAADT) is the estimated mean daily traffic volume for commercial vehicles. For continuous sites, estimates are calculated by summing the Annual Average Days of the Week and dividing by seven. For short-count sites, estimates are made by factoring a short count using Seasonal and Axle (if applicable) day-of-week adjustment factors. Data Coverage: The dataset covers the entire Federal Aid System in the State of Michigan Update Cycle: AADT & CAADT volumes are created and released every year. Transportation Data Management System (TDMS) AADT Calculation Help Traffic Monitoring Program年平均日交通量（Annual Average Daily Traffic, AADT）指经估算得到的平均日交通流量；商业车辆年平均日交通量（Commercial Annual Average Daily Traffic, CAADT）为商用车辆的估算平均日交通流量。 对于连续监测站点，其估算值通过累加周度各日的年平均交通量后除以7计算得出。对于短时计数站点，估算值通过结合季节性与轴重（如适用）的星期几调整系数，对短时计数数据进行修正后得到。 数据覆盖范围：本数据集覆盖密歇根州全境联邦援助公路系统。 更新周期：年平均日交通量与商业车辆年平均日交通量数据每年生成并发布一次。 交通数据管理系统（Transportation Data Management System, TDMS）AADT计算帮助 交通监测项目