From the Wisconsin Department of Transportation About page:

“WisDOT supports all forms of transportation. The department is responsible for planning, building and maintaining Wisconsin’s network of state highways and Interstate highway system. The department shares the costs of building and operating county and local transportation systems – from highways to public transit and other modes. WisDOT plans, promotes and financially supports statewide air, rail and water transportation.”

WisDOT provides data such as Traffic Counts, Vehicle Miles of Travel, and Safety and Crash Data. It also provides information on Traffic Forecasting.