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Agricultural Commercial Motor Vehicle (Ag CMV) new size and weight information
Ag CMV Self-Certification
The Ag CMV Self-Certification is not required. It is provided as a convenient reference for operators and law enforcement.
- 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
- 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.
- No Fee 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 weight limits do not apply on Interstate highways. §348.15 (9)(c)2.(d).
- 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.
WisDOT Division of Transportation System Development (DTSD), firstname.lastname@example.org
Last modified: June 9, 2014
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