Relaxation of Michigan weight restrictions continue to move northward

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The Michigan Department of Transportation and local agencies continue to adjust annual spring weight restriction areas to protect roads.

Effective at 6 a.m. Monday, April 11, weight restrictions will be lifted on all state trunkline highways from the southern Michigan border north to and including US-10 in Ludington in Mason County from the M-116 intersection east to US-127 in Clare County, south to US-10 in Clare County, east on US-10 to M-25 in Bay City and including the entire thumb area. 

Screen Shot 2022 04 07 At 1 08 19 PmFrost restrictions are still in effect for the remainder of the state and will be imposed and enforced on all state trunkline highways north of the US-10/M-25 line. State routes typically carry M, I, or US designations. 

In the restricted areas, the following will apply:

  • on routes designated as "all-season" (designated in green and gold on the MDOT Truck Operators Map), there will be no reduction in legal axle weights
  • on routes designated as "seasonal" (designated in solid or dashed red on the MDOT Truck Operators Map), there will be a posted weight reduction of 25 percent for rigid (concrete) pavements and 35 percent for flexible (asphalt) pavements
  • all extended permits will be valid for oversize loads in the weight-restricted area on the restricted routes. Single-trip permits will not be issued for any overweight loads or loads exceeding 14 feet in width, 11 axles and 150 feet in overall length on the restricted routes.

MDOT determines when weight restrictions begin each spring by measuring frost depths along state highways, observing road conditions, and monitoring weather forecasts. Weight restrictions remain in effect until the frost line is deep enough to allow moisture to escape and the roadbeds regain stability.

County road commissions and city public works departments put in place their own seasonal weight restrictions, which usually, but not always, coincide with state highway weight restrictions. Signs are generally posted to indicate which routes have weight restrictions in effect.

For weight restriction information and updates, call 800-787-8960, or you can access this information on MDOT's website at, under "Restrictions." All-season routes are designated in green and gold on the MDOT Truck Operators Map, which is available online. You also may sign up to receive e-mail alerts

Trucking companies located in New Jersey and Canada can obtain information by calling 517-373-6256.