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Oversize & Overweight Trucks

The Michigan Department of Transportation (MDOT) issues permits for all trucks and trailers hauling oversized/overweight loads.

An oversize/overweight transport permit is issued for the movement of oversize/overweight loads that cannot be readily dismantled or otherwise arranged to become legal dimensions and/or legal weight in order to travel legally on State highways. Legal dimensions and weights may be found on Form T-1.

Applications for these permits are submitted and paid for online through the MDOT Permit Gateway.

For additional information or questions, contact MDOT's Permit Office at 517-241-8999 or visit

Revised: 12/2019