US, State, and County Route Naming The following naming conventions are used in Wisconsin for US, State, and County route naming. US Highways US Highways (or routes) are named in Wisconsin using the standard US Road Naming guidelines. The base format of the name for these road types is: US-12 For U.S. Route 12 US-12 S For U.S. Route 12, Southbound US-12 BUS For U.S. Route 12 Business
State Highways (Routes) Wisconsin state highways are named as follows: WIS-29 For Wisconsin Route 23 WIS-29 S For Wisconsin Route 23, Southbound Note: BUS must be completely in uppercase when used for proper TTS
County Highways County highways[County Trunk Highway(CTH)] in Wisconsin are named with a "CH" prefix as illustrated below. CH-A For County Highway A