Oversize Overweight Permits 2026: State Rules, Costs & Route Tips

When an OS/OW Permit Is Required

If your load exceeds a state's legal length, width, height, or weight package on the roads you will use, you need that state's authorization. Federal interstate baselines (e.g., typical 80,000 lb GVW and common height norms) are the starting point — see weight limits by state and legal truck height by state.

Typical Multi-State Process

Escorts, Curfews & Holiday Bans

States publish width/length thresholds that require front/rear pilot cars, amber lights, or police escorts. Night travel and holiday blackouts are common for oversize. Step-deck height advantage still has limits — see step-deck clearance.

What Drives Permit Cost

Fees scale with weight, distance, and dimensions. Escort day-rates, survey costs, and delay days often exceed the permit stamp itself. Price the full package into the quote — especially vs posted board RPM that ignored OS/OW.

Day-of Checklist

The Permit Is a Route, Not a Sticker

An oversize or overweight permit is permission to move one combination, at one set of dimensions and weights, on named roads, in a window of time. It is not a sticker that makes the truck legal everywhere. The state you are in issues it. The next state issues its own. A permit that ends at the state line is a truck that must stop at the state line unless the next paper is already in the cab. Order from the dimensions and weights you measured, not from the drawing the shipper emailed. Width over about 8 feet 6 inches, height over the state maximum, length and overhang past the legal combination, and weight over the gross, the axle, or the bridge formula are the usual triggers. The page on semi truck weight limits by state and the page on legal truck height by state are the baselines. The permit is what happens after you are over them.

Do not memorize a national price. States charge different fees, and the fee is the small part of the cost. Escorts, a route survey, daylight-only travel, weekend bans, and a day you cannot move because the permit office is closed are the cost. A broker who says permits are handled should say who orders them, who pays the escort, and whose name is on the permit. If your name has to be on it, you need it before you hook the freight. A promise to send it after you roll is how drivers sit at a scale with a load they cannot legally move and cannot legally take back. Get the PDF, read the route, and compare it to the roads you were actually going to use.

The route on the permit is the route. Truck GPS, the shipper's favorite shortcut, and a fuel stop a mile off the red line are how permitted loads become unpermitted loads. If the receiver is not on the route, stop and amend the permit before you follow the pin. Bridges that cannot clear your measured height will be listed as must-avoid or will be absent from the route on purpose. A faded sign is still a bridge. Escorts, when the state requires them, are part of the permit, not a suggestion you can skip because traffic is light. Curfews and holiday restrictions are on the permit or in that state's provision sheet. They are not the same week in every state. Read the one you paid for.

Weight permits and dimension permits solve different problems and often travel together. A piece that is legal on height can still be illegal on a tandem. A piece that scales can still be two feet wide. Declare all of it. Understating height or weight to make the permit cheaper is how people hit bridges and how people get the load parked. If the freight changes after the permit is issued, because a part was added or the axle spacing changed, the permit has to change. Photograph the tape and the scale ticket with the trailer number. That set is what you send when someone asks whether you matched the paper.

Plan the clock around the permit, not the other way around. Daylight-only and a curfew at dusk mean you cannot make up time after dark. The 14-hour window does not care that the permit office opened late. If you cannot cover the permitted miles inside the hours you have and inside the permit's travel window, do not start. A permitted load parked in an unapproved place overnight can be a violation even though the dimensions were right. Ask, when you order, where the combination is allowed to stop. Then stop there. The permit is the permission. The route, the time, and the measured truck are the conditions. Miss one and you are just heavy, tall, or wide, without the paper that made it legal.

Put the permit packet in the cab where the officer expects it: the permit, the route, the provision sheet, and the measurement photos. A permit saved on a phone with no signal is a permit you do not have. If an escort is required, confirm the escort is with you before you enter the permitted miles, not at the scale that stops you for running without one. If the permit has a time window, the combination is unpermitted outside that window even if you are on the right road. Start only when the window, the hours of service, and the daylight rule can all be true at the same time. When they cannot, wait for the next legal window. Waiting is cheaper than a load that is suddenly just wide.

Measure twice because the permit will not forgive the second inch. Length, width, height, and overhang are separate declarations. Weight on the steer, the drives, and the trailer are separate from the dimensions. If any one of them changes after the crane sets the piece, you are back at the start: new measurements, new permit if the paper no longer matches, and no rolling while you wait. A shipper who is in a hurry is not a permitting authority. Neither is a broker. The state that issued the paper is. Call that office when the freight does not match, and stay parked until the paper does. The load can be late. The bridge cannot be moved.

Tell the driver, not only the office, what the permit forbids. Curfew, holiday, weather, no travel after dark, escorts required, bridges banned. A permit in a dispatch email that the driver never opened is the same as no permit at the scale. Read it before the combination is built, while the freight can still come off. If you are the driver and the office will not send the permit, do not hook. You are the person who will be asked to show it. Being told it was ordered is not being shown it. The state will ask to see the paper. Have the paper.

Frequently Asked Questions

Related: weigh station bypass, flatbed dimensions, semi weight, axle limits.

How Our Team Helps

At O Trucking LLC, we treat compliance, equipment fit, and dispatch contracts as load-winning fundamentals — not afterthoughts.