Wisconsin Oversize and Overweight Trucking Regulations

Operating oversize or overweight (OSOW) loads in Wisconsin requires adherence to strict regulations managed by the Wisconsin Department of Transportation (WisDOT). According to Wisconsin Statute Chapter 348, vehicles exceeding standard size and weight limits must obtain specific permits to utilize state trunk highways. Standard maximum legal dimensions without a permit are 8 feet 6 inches in width, 13 feet 6 inches in height, and a gross vehicle weight of 80,000 pounds. Any load exceeding these parameters, or specific length limits based on vehicle configuration, requires a single-trip or multiple-trip permit. DispatchTool assists carriers in managing these complex requirements by tracking vehicle dimensions and weight profiles across your fleet to ensure the correct permit types are requested. Users can store digital copies of issued WisDOT permits directly within the platform for immediate driver access during roadside inspections or at weigh stations. By centralizing load documents and equipment specs, dispatchers reduce the risk of routing a 14-foot wide load on a restricted two-lane highway. Create a DispatchTool account to start organizing your permit documentation and fleet specifications in one secure location.

Legal Dimensions and Weight Limits

In Wisconsin, the legal width limit is 8 feet 6 inches, and the height limit is 13 feet 6 inches. The overall length for a tractor-semitrailer combination is generally limited to 75 feet on designated highways. For weight, the maximum gross vehicle weight is 80,000 pounds spread across five axles, with single-axle limits of 20,000 pounds and tandem-axle limits of 34,000 pounds. Any vehicle exceeding these thresholds requires a permit issued under Wis. Stat. s. 348.25. Permits are mandatory for non-divisible loads that cannot be reasonably dismantled or shrunk to fit legal dimensions.

Single-Trip Permit Fees and Procedures

WisDOT issues single-trip permits (Form MV2602) which are valid for five days. The base fee for a single-trip oversize permit is $15.00. However, overweight loads incur higher costs based on the weight exceeding 80,000 pounds. For example, an overweight permit for a vehicle up to 150,000 pounds costs approximately $60.00, while loads exceeding 150,000 pounds are assessed a fee of $60.00 plus $20.00 for every 10,000 pounds over that threshold. Applications are processed through the Wisconsin Oversize/Overweight Permit (WisOOP) system, which calculates fees based on the specific route and weight distribution.

Escort Vehicle and Flagging Requirements

Escort vehicles, also known as pilot cars, are required based on the dimensions of the load. For widths exceeding 12 feet but not more than 15 feet, one escort is typically required on non-divided highways. If the width exceeds 15 feet, two escorts are mandatory. Any load exceeding 16 feet in width or 100 feet in length requires a law enforcement escort in addition to civilian pilots. All OSOW vehicles must display clean, bright red or orange flags at least 18 inches square at the four corners of the load. 'Oversize Load' signs measuring 7 feet by 18 inches must be mounted on the front and rear of the vehicle.

Seasonal Weight Restrictions (Spring Thaw)

Wisconsin implements seasonal weight restrictions, commonly known as 'Class B' highway restrictions, to protect roads during the spring thaw. During these periods, WisDOT may reduce allowable axle weights by up to 50% on specific secondary routes. These restrictions usually begin in early March and can last through May depending on frost levels. Carriers must monitor the WisDOT website or the 511 Wisconsin system for daily updates. Violating these seasonal limits can result in fines exceeding $500 per axle, depending on the degree of the overweight violation.

Multiple-Trip and Annual Permits

For carriers frequently moving similar loads, WisDOT offers multiple-trip permits valid for 12 months. An annual permit for a standard oversize vehicle (no overweight) costs $60.00. Annual permits for overweight vehicles are tiered: $200.00 for up to 120,000 lbs, $350.00 for up to 150,000 lbs, and $500.00 for loads exceeding 150,000 lbs. These permits allow for unlimited trips within the 12-month period, provided the dimensions and routes remain within the parameters specified on the permit document. Carriers must still check for temporary construction closures that may affect their pre-approved routes.

Travel Time and Holiday Restrictions

Oversize loads in Wisconsin are generally permitted to travel from sunrise to sunset, Monday through Friday. Weekend travel is often restricted for loads exceeding 12 feet wide or 100 feet long. Specifically, travel is prohibited from noon on the day before a major holiday (such as July 4th or Labor Day) until sunrise the day after the holiday. In Milwaukee County and other high-congested areas, OSOW travel is prohibited during peak hours, typically 6:00 AM to 9:00 AM and 3:00 PM to 6:00 PM. Night travel is only permitted with specific lighting equipment and if the dimensions do not exceed 10 feet in width or 100 feet in length.

Bridge and Structure Clearances

Wisconsin features over 14,000 bridges, and many on local or secondary roads have vertical clearances lower than the interstate standard of 16 feet. When applying for a permit, WisDOT's automated system checks the proposed route against a database of bridge heights and load ratings. If a load is over 14 feet 6 inches high, the carrier is responsible for providing a route survey to ensure all overhead obstructions, including utility lines and traffic signals, can be cleared. A minimum of 3 inches of clearance is required for all overhead structures during transit.

Sources

Wisconsin Department of Transportation (WisDOT) - OSOW Permits (2024) — https://wisconsindot.gov/Pages/dmv/com-drv/trks-wgt/osow-general.aspx Wisconsin State Legislature - Chapter 348 (2024) — https://docs.legis.wisconsin.gov/statutes/statutes/348 Wisconsin DOT - Oversize/Overweight Permit Fees (2024) — https://wisconsindot.gov/Pages/dmv/com-drv/trks-wgt/permits.aspx

Frequently asked

What is the maximum width allowed without an escort in Wisconsin?

You can generally travel without a civilian escort in Wisconsin if your load is 12 feet wide or less, provided you stay on divided highways and follow all other flagging rules.

How much does a Wisconsin single-trip permit cost?

The base fee for an oversize-only single-trip permit is $15.00, while overweight permits start at $15.00 and increase based on weight, often reaching $60.00 or more for heavy hauls.

Are there night driving allowances for oversize loads?

Night travel is allowed for loads that are not more than 10 feet wide, 14 feet 6 inches high, or 100 feet long, provided the vehicle has the required warning lights and the permit specifically authorizes it.

When does the spring weight restriction start in Wisconsin?

The start date varies annually based on weather but typically begins in early March; WisDOT issues a 48-hour notice before restrictions take effect on state highways.