LANSING, Mich. (Michigan News Source) – Starting Wednesday, April 12, weight restrictions will be lifted on all state trunkline highways from Michigan’s southern boarder to north of the Mackinac Bridge.

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Frost 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 Mackinac Bridge. State routes typically carry M, I, or US designations.

When roads that have been frozen 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 contributes to pothole problems already occurring due to this winter’s numerous freeze-thaw cycles.

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.

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