Annual Traffic Report

The Annual Traffic Report (ATR) summarizes traffic data maintained by the Washington State Department of Transportation for the State Highway System. The report includes Annual Average Daily Traffic (AADT) figures and truck percentages, when available, for locations where data collection has occurred within the past four years. Also included are: a list of Automated Data Collection (ADC) station locations; an annual summary of data from all operational ADC stations; a table of Average Weekday Traffic (AWDT) to AADT conversion factors from all operational ADC stations; a ten-year history of AADTs from ADC stations, ferry systems and toll crossings; Annual Vehicle Miles of Travel (AVMT) information for the State Highway System; and a copy of the latest Washington State Traffic Flow Map.

Please note that the 1960 ATR uses the pre-1964 highway numbering scheme, which is inconsistent with the current scheme. The 1965 report entitled The Identification of State Highways provides a cross reference between the old and new highway numbers (available at http://www.wsdot.wa.gov/Library/History.htm). Also note that prior to the 1987 ATR, traffic volumes were primarily reported in terms of number of axles divided by two, not number of vehicles.

To request an alternate media of the Annual Traffic Report, please contact our Web & GIS via Email.