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Governor signs bill modernizing regulations for ag vehicles

April 24, 2014

New law aimed at protecting roads, bridges and economic health of ag industry

A measure signed into law yesterday by Governor Scott Walker increases weight limits for agricultural vehicles traveling on public roadways, modernizes the definition of so-called "Implements of Husbandry" (IoH), and creates a new class of vehicles – agricultural commercial motor vehicles (Ag CMV). Senate Bill 509 (Act 377) represents months of comprehensive analysis by an IoH Study Group that included public meetings and input from farmers, law enforcement, ag equipment manufacturers, local officials and others.

"This bill strikes a thoughtful balance between the needs of our agricultural economy and the responsible management of our state and local roads and bridges," said Wisconsin Department of Transportation Secretary Mark Gottlieb. "We will continue working closely with our many industry and local government partners including the farm community to implement this law."

Under the new law, vehicles defined as IoH or Ag CMVs will generally be allowed to operate at weight limits 15-percent higher than previously allowed unless seasonal or other special weight postings apply. The bill also:

  • Sets length and width limits for various ag-vehicles and Ag CMVs;
  • Details lighting and marking requirements for IoH;
  • Provides local governments flexibility in administering the length and weight limits;
  • Prohibits motorists from passing an IoH or Ag CMV in a no-passing zone.

More information regarding the new law can be found on the "Doing Business" section of the WisDOT website under "Ag Equip."

For more information, contact:
Rob Miller, WisDOT Office of Public Affairs
(608) 266-3581,



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