Overview
Michigan oversize and overweight permits are issued by the Michigan Department of Transportation, Transport Permits Unit. Single-trip permits are valid for five consecutive days, excluding Saturdays and Sundays.
Permit approval depends on the proposed route, dimensions, weight and infrastructure conditions.
Permit Office
| Office | Michigan Department of Transportation, Transport Permits Unit |
| Address | 7050 West Saginaw, Suite 2/M-43, Lansing, Michigan 48917 |
| Contact | (517) 373-2121 |
| Hours | 7:30 A.M. – 4:30 P.M. (ET) |
Permit Basics
| Permit validity | Single-trip permits are valid for five (5) consecutive days, excluding Saturday and Sunday. |
| Operating time | 7:30 A.M. – 4:30 P.M. (ET) |
Dimensions & Weights
Routine permit limits
| Length | 150′ |
| Width | 16′; 14′ during spring restrictions |
| Height | 15′ |
| Weight | Handled on a case-by-case basis |
Escort Requirements
| Based on | Escorts required |
|---|---|
| Width | On all highways — width over 12′ to 14′: 1 |
| Width | On all highways — width over 14′: 2 (front & rear) |
| Length | On all highways — length 90′ to 100′: 1 rear |
| Length | On all highways — length over 100′: 2 (front & rear) |
| Overhang | On all highways — overhang over 15′: 1 rear |
| Height | On all highways — height over 14′5″ with high pole: 1 front |
| Height | On all highways — height over 15′ with high pole: 2 (front & rear) |