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Michigan Frost Laws, Seasonal Load Weight and Speed Restrictions – 2024

Spring Thaw Restriction Bulletin #2

Date: 02/16/2024

Effective 6:00 a.m. on Friday, February 16, 2024, weight restrictions will be lifted on all state trunkline highways from the southern Michigan border north to and including US-2/US-141 at the Menominee River bridge west of Iron Mountain, then east on US-2 to St. Ignace. 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 US-2 and M-185 on Mackinac Island.

State trunkline highways typically carry M, I, or US designations. Weight restriction information and updates may be obtained by calling 1-800-787-8960. For companies in Canada or New Jersey, data may be received by calling 517-335-0023.

- On routes designated as "All Season Routes" (green or gold on the MDOT Truck Operators Map), legal axle weight will not be reduced.

- On routes designated as "Seasonal" (solid or dashed red on the MDOT Truck Operators Map), there will be a weight reduction of 25% for rigid pavements and 35% for flexible pavements.

Extended permits will be valid for oversize only in the weight-restricted area.

Single-trip permits will not be issued for overweight loads or loads exceeding 14 feet in width, 11 axles, and 150 feet in overall length in the weight-restricted area.

Detailed Weight Restriction information may be obtained by linking to

Please refer to the MDOT Truck Operator's Map for route designations.

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