The Michigan Department of Transportation and local agencies are enacting spring weight restrictions. Effective 6 a.m. Monday, Feb. 24, weight restrictions will be imposed and enforced on all state trunkline highways within the following area of Michigan to protect highways:
- Highways south of a line on M-46 in Muskegon County from US-31 Business Route in the city of Muskegon east to US-131, then north on US-131 to M-46 and east to I-75 near Saginaw, then north on I-75 to M-25 near Bay City and continuing east on M-25 to M-46 in Port Sanilac in Sanilac County, including the entire Thumb region. All state trunk lines between these two lines will have weight restrictions imposed and enforced. 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 oversized 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 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.
