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.

Implements of Husbandry (IoH) and Agricultural Commercial Vehicles (Ag CMV) Permit

2013 Wisconsin Act 377 created a free permit for IoH and Ag CMV exceeding the new weight and length limits. The permits must be obtained from the maintaining authority (municipality, town, county, state) of the roads to be operated upon. WisDOT created the application which will be used by all maintaining road authorities that require a permit to operate over the new weight and length limits.

State No-Fee Permit Application for IoH and Ag CMV

The IoH/Ag CMV permit application form will be used by WisDOT beginning on May 23, 2014; however the application is not required to be used until Jan. 1, 2015.

Local government No-Fee Application for IoH and Ag CMV

Depending upon the action a municipality or county may take, an operator may be required to apply for a no-fee permit from the maintaining authority of the road on which the IoH/Ag CMV is being operated on.

Determine if a permit is required

Wisconsin Act 377 increased the weight limits allowed without a permit for IoHs and weight and width limits for AgCMVs effective April 24, 2014. An IoH/Ag CMV permit may be required if your vehicle exceeds the length and/or weight listed below. There is no fee for this permit.

IoH length

  • Single vehicle
    • 60 feet
    • IoH/Ag CMV Permit may be required over 60 feet.
  • Two vehicle combination
    • 100 feet
    • IoH/Ag CMV Permit may be required over 100 feet
  • Three vehicle combination
    • No more than 100 feet with speed restriction of 25 mph or less OR 70 feet at a speed greater than 25 mph.
    • IoH/Ag CMV Permit may be required if exceeding 100 feet in length.
    • Towed units being drawn by a motor truck, truck tractor, or Ag CMV must be empty. “Empty” means less than 20 percent full.
    • Length limits also apply to IoH being operated or transported for delivery, service, repair by dealer or farmer within 75-mile radius of business or farm. Beyond these dimensions or the designated radius, you may be eligible for a standard Oversize/Overweight commercial (single or annual) permit.

Ag CMV length

  • Single vehicle
    • 45 feet
    • No-Fee permit may be required over 45 feet
  • Two vehicle combination – one towed unit driven by a power unit
    • 70 feet
    • No-Fee permit may be required over 70 feet
  • Three vehicle combination - two towed units drawn by a power unit.
    • No more than 100 feet with speed restriction of 25 mph or less or 70 feet at a speed greater than 25 mph.
    • No-Fee permit may be required if exceeding 100 feet in length.
    • Towed units being drawn by a motor truck, truck tractor, or agricultural commercial motor vehicle must be empty. “Empty” means less than 20 percent full. §348.08(1)(d)

IoH/AG CMV weight

  • New maximum IoH/Ag CMV weight limits table applies. This allows for a maximum single axle weight of 23,000 pounds and a gross vehicle weight of 92,000 pounds dependent on number of axles and axle spacing.
  • IoH/Ag CMV Permit may be required if gross vehicle weight or axle weight is greater than the IoH weight table.
  • All operators must abide by seasonal or other special postings.
  • IoH/Ag CMV Maximum Weight Limits do not apply on Interstate highways. §348.15 (9)(c)2.(d)
  • Exemptions
    • Empty potato harvester is exempt from axle weight limit. Also exempt from Class B road postings.
    • Category B is:
      • Exempt from axle weight limits unless local road authority passes ordinance or resolution limiting self-propelled IoH axle weight.
      • Exempt from gross vehicle weight and axle weight limits when operating between fields and operated on the highway for a distance of 1/2 mile or less.
      • Exempt from Class B road postings.
    • IoH traveling for delivery, service, repair by dealer or farmer within 75-mile radius of business or farm is exempt from gross vehicle weight and axle weight limits. Also exempt from Class B road postings. If you are traveling beyond the 75 mile radius you may be eligible for a standard Oversize/Overweight commercial (single or annual) permit.

Vehicle measurements

To complete the form you will need:

  • Maximum gross motor vehicle weight of the vehicle or vehicle combination in operation mode.
  • Maximum axle weight of the vehicle or vehicle combination in operation mode.
  • Distance between each individual axle (to qualify as an individual axle – there must be more than 42 inches from the previous axle).
  • Axle gauge, which is measured from the center of the left tire (or center of a group of tires) to the center of the right tire (or center of a group of tires). Typically, a standard vehicle has an axle gauge of six feet. IoH axle gauges vary. Axle gauge has significant impact in how vehicle weight is distributed on bridges.

To assist you in completing the form, please refer to the completed sample permit and the diagrams below:

Diagrams - Axle measurements

For more information

For questions, contact:

  • Email: AgVehicles@dot.wi.gov
  • Call: (608) 266-7320
  • Fax: (608) 264-7751
  • Mail:
    Wisconsin Department of Transportation
    PO Box 7980
    Madison, WI 53707-7980

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