Wisconsin Department of Transportation

Alert: The following services will be unavailable on Saturday, January 5, 2013 from 12 a.m. (midnight) to 6 a.m. CST due to system maintenance.

Agricultural equipment and vehicles

Tractor sign along the edge of a roadway

Senate Bill 509 makes several changes to the way agricultural vehicles may operate on the public roadway. The most significant changes include:


In general, under the new law, vehicles defined as IoH and Ag CMVs will be allowed to operate at 15 percent higher weight limits than previously allowed, or 92,000 pounds Gross Vehicle Weight (GVW) and 23,000 pounds per axle, dependent on number of axles and axle spacing and subject to seasonal or special postings. An IoH/Ag CMV Maximum Weight Limits table was created to reflect these new limits.

The definition and weight provisions are effective immediately. By the end of May, WisDOT will publish the new no-fee permit application. This application will be used by all maintaining road authorities who require a permit to operate over the new GVW and axle weight limits.

In addition to the expanded weight limit, the bill:

  • Exempts all IoH and Ag CMVs from registration.
  • Exempts empty potato harvesters, and in certain situations Category B IoH vehicles, from axle weight limits.
  • Sets new length limits for single, two- and three-vehicle combinations.
  • Requires additional lighting and marking, effective Nov. 2015, for IoH that exceed 15 feet in width. Vehicles exceeding 22 feet in width will need to be accompanied by an escort vehicle.
  • Sets new width limits of ten feet for Ag CMVs, allowing up to 12 feet for certain vehicle’s fenders, fender flares or tires.
  • Creates a self-certification process for Ag CMVs.
  • Requires sellers of farm equipment to disclose the gross vehicle weight of farm equipment, effective Jan. 2015.
  • Prohibits passing of an IoH or Ag CMV in a no-passing zone.
  • Directs State Patrol to issue warnings only for farm tractors and Category B IoH vehicles exceeding the new limits until Jan. 15, 2015.

View the full SB 509.

Note - You may want to bookmark this site. FAQ and updates on the permit process will be added as more information is available.

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