Wisconsin Department of Transportation

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Agricultural Commercial Motor Vehicles (Ag CMVs)

Width | Height | Length | Weight | Trailering


Act 377 created a new type of vehicle - “Agricultural commercial motor vehicle" (Ag CMV). The current definition of Ag CMV is a commercial motor vehicle to which all of the following apply:

  • The vehicle is substantially designed or equipped, or materially altered from its original construction, for the purpose of agricultural use.
  • The vehicle was designed and manufactured primarily for highway use.
  • Unless the vehicle was manufactured prior to 1970, the vehicle was manufactured to meet federal motor vehicle safety standard certification label requirements as specified in 49 CFR 567.
  • The vehicle is used exclusively in the conduct of agricultural operations.
  • The vehicle is being used in any of the following ways:
    1. For directly distributing feed to livestock or for directly applying fertilizer (but not manure), lime, spray, or seeds to a farm field. (Also called Category 1)
    2. For assisting another vehicle directly harvesting farm products by receiving farm products as they are harvested or for assisting another vehicle directly planting potatoes by delivering seed potatoes to the planter. (Also called Category 2)
    3. For directly applying manure to a farm field or for off-loading manure if field conditions do not permit application by the vehicle directly to the field. (Also called Category 3)

View s. 340.01 (1o), Wis. Stats.

Ag CMV Self-Certification

A self-certification process for Ag CMVs was also created.The Ag CMV Self-Certification is not required. It is provided as a convenient reference for operators and law enforcement.

View the AgCMV Self-Certification form

Ag CMV Dimensions

The following dimension and weight limits were created for Ag CMVs:


  • Width limit is 10 feet including attachments or accessories
  • Exception: Pesticide sprayers, lime and fertilizer spreaders (not including manure) with extending tires, fenders and fender flares may not exceed 12 feet in width.


  • 13 feet 6 inches


  • 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)

To operate at lengths greater than those listed above, you may need to apply for an IoH/Ag CMV Permit from the maintaining authority for the roads on which you are proposing to operate.


  • IoH/Ag CMV Maximum 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.
  • Ag CMVs that directly distribute feed to livestock or directly apply fertilizer (but not manure), lime, spray, or seeds to a farm field (also called Category 1 Ag CMV) are:
    • Exempt from axle weight limits on local roads unless local goverment authority passes ordinance or resolution limiting Ag CMV 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.
  • No Fee Permit may be required if gross vehicle weight or axle weight is greater than the IoH/Ag CMV weight table.
  • All operators must abide by seasonal or other special postings.
  • IoH weight limits do not apply on Interstate highways. §348.15 (9)(c)2.(d), Wis. Stats.
  • Exemptions:
    • Ag CMVs 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. Exemptions also pertain to Class B highways.

To operate at weights greater than those listed above, you may need to apply for an IoH/Ag CMV Permit from the maintaining authority for the roads on which you are proposing to operate.

Trailering Ag CMVs

Act 15 allows operators to transport Ag CMVs on trailers or semi-trailers from farm to field, field to field and farm to farm under the same weight and dimension limits that are allowable for the Ag CMV being transported. Please refer to the height, length, width and weight sections listed above. If the 2-vehicle combination transporting an Ag CMV exceeds the Ag CMV length, axle weight or gross weight limit, the operator may apply for a no-fee permit.

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