Michigan Frost Laws, Seasonal Load Weight and Speed Restrictions – 2021

Effective Friday, April 2, 2021, 6 a.m., weight restrictions will be lifted on all state trunkline highways from the southern Michigan border north to the Mackinac Bridge. 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.

Weight Restriction information and updates may be obtained by calling 1-800-787-8960. For companies located in Canada or New Jersey, information may be obtained by calling 517-335-0023.

On routes designated as "All Season Routes" (green & gold on the MDOT Truck Operators Map), there will be no reduction in legal axle weight. On routes designated as "Seasonal" (solid or dashed red on the MDOT Truck Operators Map), there will be a 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 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 www.michigan.gov/truckers Please refer to MDOT Truck Operators Map for route designations.

Latest Update

Title: Spring Weight Restriction Bulletin #6

Date: 04/12/2021

Effective Monday, April 12, 2021, 6 a.m., 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 trunk line highways typically carry M, I or US designations. 

Weight Restriction information and updates may be obtained by calling 1-800-787-8960. For companies located in Canada or New Jersey, information may be obtained by calling 517-335-0023. 

On routes designated as "All Season Routes" (green & gold on the MDOT Truck Operators Map), there will be no reduction in legal axle weight. On routes designated as "Seasonal" (solid or dashed red on the MDOT Truck Operators Map), there will be a 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 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 www.michigan.gov/truckers Please refer to MDOT Truck Operators Map for route designations.

Updates

Detailed Weight Restriction information may be obtained by linking to www.michigan.gov/truckers

Weight restriction information and updates may be obtained by calling 1-800-787-8960. For companies located in Canada or New Jersey, information may be obtained by calling 517-373-6256. check https://mdotjboss.state.mi.us/APSWB/searchBySpringWeight.htm?year=2021

For the most recent info, Please refer to the:

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