Commercial Vehicles


For information on restricted roads and bridges see our Truck Operators Map
(also see MDOT's 2008 Truck Operator's Map)

or see the All-Season roads list and the Restricted Bridges & Culverts list

NORMAL LOADING MAXIMUMS
18,000 lbs. on single axles spaced 9 ft. or more apart 
13,000 lbs. on tandem axles spaced 3.5 ft. to 9 ft. apart
9,000 lbs. on axles separated by less than 3.5 ft.
13,000 lbs. per axle maximum, tri-axle and multi-axles.

DESIGNATED LOADING

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

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SEASONAL RESTRICTION (Frost Law) LOADING MAXIMUMS 
35% REDUCTION OF NORMAL LOADING PER AXLE (as follows):
11,700 lbs. on single axles spaced 9 ft. or more apart
8,450 lbs. on tandem axles spaced 3.5 ft. to 9 ft. apart
5,850 lbs. on axles separated by less than 3.5 ft.
8,450 lbs. per axle maximum, tri-axle and multi-axles.
35 mph maximum speed limit.

ALL-SEASON ROAD LOADING MAXIMUMS
18,000 lbs. on single axles spaced 9 ft. or more apart
16,000 lbs. on tandem axles spaced 3.5 ft. to 9 ft. apart
*Only one tandem axle assembly permitted @ 32,000 lbs., no other tandem axle assembly shall exceed 26,000 lbs.
9,000 lbs. on axles separated by less than 3.5 ft.
13,000 lbs. per axle maximum, tri-axles and multi-axles.

Weight determinations are based on axle configuration in the
Michigan Truck Safety Commission publication "Truck Driver's Guidebook" 

 

2002 Frost Law restrictions were in effect 1/23 to 3/25