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Traffic counts

Traffic counts are reported as the number of vehicles expected to pass a given location on an average day of the year. This value is called the "annual average daily traffic" or AADT and are represented on traffic count or traffic volume maps. The AADT is based on a short-term traffic count, usually 48 hours, taken at the location. This count is then adjusted for the variation in traffic volume throughout the year and the average number of axles per vehicle.

The short-term counts are collected over a three-year cycle at nearly 26,000 rural and urban locations throughout the state. Data from 2000 to 2005 are currently included. If counts from other years are used, the year the count was taken will be indicated on the page. This situation may arise if a count could not be taken in the current cycle because of highway construction.

Traffic counts are rounded according to the following scheme:

In all cases, if a value is 0 through 4, it is rounded down; and if the value is 5 through 9, it is rounded up.

The traffic volume maps are arranged in alphabetical order by county and then alphabetically by city within each county. Detail and interstate maps precede the city maps where needed. The traffic counts taken in most incorporated municipalities with a population under 2,500 are shown on the detail or inset maps. All counties in the state are included. The AADT volumes shown are representative of the year indicated on each map. Any exceptions are noted on the map.

Questions about the content of this page:
Bureau of State Highway Programs, traffic.counts@dot.state.wi.us
Last modified: March 10, 2008