Wisconsin OSOW permits

Updated: Sep 2

Permits valid for fourteen consecutive days. Must have a permit prior to entering the state.

Wisconsin permitting system: https://wisconsindot.gov/Pages/dmv/com-drv-vehs/mtr-car-trkr/osow-autosys.aspx

Contact phone number: 1-608-266-7320


Loads not exceeding 12' wide, 13'6" high or 100' long may run 24/7, except between 4:00 PM to 11:00 PM on Sunday, and between 4:00 P.M. to 11:00 P.M. between the fourth Sunday in May and Labor Day. Greater than these dimensions may not run during hours of darkness, not from Noon on Saturday until sunrise on Monday, and not between 4:00 P.M. to 11:00 P.M. between the fourth Sunday in May and Labor Day. Overweight only can travel 24/7, including weekends and holidays unless otherwise stated on the permit.


Travel is restricted on major holidays and holiday weekends, with some variations according to size. Double-check with the Sammons Permit Office.


Width: 8'6"

Height: 13'6"

Length: 53' semi-trailer on designated highways (provided kingpin to the center of rear tandem or to the center of the last axle of a Tridem does not exceed 43'), 48' semi-trailer and 75' overall on other roads

Weight: 80,000 Gross Single – 20,000 Tandem – 34,000 Tridem – 42,000 (43,000 with 9' of spacings)


Width: 16'

Height: Depends on routes

Length: No set limit

Weight: Single – 30,000 (with 4 tires) Tandem – 65,000 Tridem – 81,000 Loads exceeding 16' or 150,000 pounds are considered as Super Loads.


Width: Over 15' – 1 escort

Height: Usually not required, depends on routes

Length: Usually not required


Spring thaw overweight restrictions usually go into effect on "Class 2 Roads" from approximately early March until mid-May. Interstates and US Highways are normally not restricted. The start date varies from year to year. Check with the Sammons Permit Office.


Farm equipment delivered to a Wisconsin destination and not using any Interstate routes does not need a permit, but can only run on Monday through Thursday and up to 2:00 PM on Friday.


"Oversize Load" signs required when vehicle/load exceeds 10' wide or is overlength. They must be lit up to run at night. Flags (18" square) are required at the front and rear corners of over width loads, and at the widest point of any load which is more than 4" wider than the vehicle or the front or rear corners of the load. When overlength, a single flag shall be fastened at the extreme rear of the load if the overlength or projecting portion is 2' wide or less, or 2 flags if over 2' wide. Lighting rules for night moves are specified in the Wisconsin Permit General Provisions (MV2605) sheet.

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