Federal Highway Administration

The Federal Highway Administration Office of Highway Policy Information provides innovative, timely, and customer responsive publications. The Office of Highway Policy Information provides information on state-level data such as drivers, vehicles, highway mileage and performance, state/local highway finance, motor fuel usage, and travel.
http://www.fhwa.dot.gov/

Traffic Volume Trends Report

Last Updated: Apr 28, 2017, 10:03 EDT    Next Release: Dec 28, 2017, 10:00 EST

Traffic Volume Trends is based on hourly traffic data reported by the states. The vehicle miles traveled (VMT) is calculated using the Highway Performance Monitoring System (HPMS). HPMS includes the annual average daily traffic (AADT) by road segment. The AADT is then multiplied by the length of the road segment and summed for all road segments which gives the annual VMT. The monthly VMT is estimated by combining the change rates for each month with the most recent annual VMT.

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