Q. Traffic Counts
The Federal Highway Administration's (FHWA's), Office of Highway Policy Information has traditionally maintained national programs to track traffic trends, vehicle distributions, and weight to meet data needs specified in federal highway legislations. Activities include development of guidelines, regulations, direct data collection (from State DOT sources), data processing, research, analysis, and professional conferences.
Please visit their web page at: http://www.fhwa.dot.gov/policyinformation/travelmonitoring.cfm