Do I need an oversize permit?
A load needs an oversize permit whenever any single dimension exceeds a jurisdiction's legal maximum. Those limits are broadly similar across North America, but the details vary by state, province, and route.
Typical legal maximums (always confirm for your exact route):
- Width — 8 ft 6 in (102 in) in the U.S. and most of Canada. Anything wider needs a permit.
- Height — commonly 13 ft 6 in or 14 ft. There is no federal height limit; it is set by the state and by the real clearances on your route.
- Length — set per vehicle configuration rather than one number. Long combinations and rear overhang can trigger a permit on their own.
- Weight — 80,000 lb gross is the routine federal ceiling, but the Federal Bridge Formula and axle limits decide what you can carry before an overweight permit.
- Measure your load's real width, height, length, and gross weight — including the trailer and any overhang.
- Enter them in the free Permit & Escort Checker and pick your state to see which dimensions are over.
- Get a permit from each state or province you travel through — permits are not transferable across borders.
This is planning guidance, not legal authorization. Always confirm current limits with the issuing state or provincial DOT and pull the actual permit before you move.