Commercial Vehicles

Permits

For copies of permits required by the Weighmaster please visit our permits section.

Axle Loading Information

Normal Loading Maximums

• 18,000 pounds on single axles spaced 9 feet or more apart
• 13,000 pounds on tandem axles spaced 3.5 feet to 9 feet apart
• 9,000 pounds on axles separated by less than 3.5 feet
• 13,000 pounds per axle maximum, tri-axle and multi-axles

Designated Loading

16,000 pounds per axle on one tandem axle assembly.

Seasonal Restriction Loading Maximums

35% Reduction of Normal Loading Per Axle (as follows):

• 11,700 pounds on single axles spaced 9 feet or more apart
• 8,450 pounds on tandem axles spaced 3.5 feet to 9 feet apart
• 5,850 pounds on axles separated by less than 3.5 feet
• 8,450 pounds per axle maximum, tri-axle and multi-axles
• 35 miles per hour maximum speed limit

All-Season Road Loading Maximums

• 18,000 pounds on single axles spaced 9 feet or more apart
• 16,000 pounds on tandem axles spaced 3.5 feet to 9 feet apart
• Only one tandem axle assembly permitted at 32,000 pounds., no other tandem axle assembly shall exceed 26,000 pounds
• 9,000 pounds on axles separated by less than 3.5 feet
• 13,000 pounds per axle maximum, tri-axles and multi-axles

Weight determinations are based on axle configuration in the

Michigan Truck Safety Department publication "Truck Driver's Guidebook"