MDOT weight restrictions in effect

MARQUETTE — The Michigan Department of Transportation and local agencies are enacting spring weight restrictions, an annual move to protect roads.

Weight restrictions, which became effective 6 a.m. Monday, will be imposed and enforced on all state trunkline highways from the Michigan border north to and including M-20 from the interchange with U.S. 31 in Oceana County, then east on M-20 to U.S. 131, then north on U.S. 131 to M-20 in Mecosta County, then east on M-20 to U.S. 10 in Midland County, then east on U.S. 10 to M-25 in Bay City, including the entire Thumb region.

All state trunklines in this area will have weight restrictions imposed and enforced. State routes typically carry M, I, or US designations.

When roads that have been frozen all winter begin to thaw from the surface downward, melting snow and ice saturate the softened ground. During the spring thaw, the roadbed softened by trapped moisture beneath the pavement makes it more susceptible to damage. This also contributes to pothole problems already occurring due to this winter’s numerous freeze-thaw cycles.

In the restricted areas, the following will apply:

≤ On routes designated as all-season, there will be no reduction in legal axle weights.

≤ On routes designated as seasonal, 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 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. People also may sign up to receive email alerts.

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