How Big Can Your Load Get Before It Needs Permits and Escorts?

A load is oversize when it is wider, taller or longer than state law allows without a permit. On the National Network of highways, federal law sets width at 102 inches (8′ 6"). There is no federal height limit; state limits range from 13′ 6" to 14′ 6". Most tractor-semitrailers have no federal overall length limit, but states must allow at least a 48′ 0" semitrailer, and many allow longer. Exact limits vary by state.

You need a permit when a load goes past the state’s legal width, height, length or weight. The federal government does not issue these permits; each state does, for its own roads. Permits are generally only for non-divisible loads, meaning items that can’t reasonably be taken apart to make them legal. Rules and fees vary by state.

It depends on the state and the route, and the permit sets the final number and placement. FHWA’s escort guidance lists provisions common in many states: one escort over 12′ 0" wide, often two escorts over 14′ 0" wide, one escort over 90′ 0" long, two over 150′ 0" long, and a front escort with a height pole over 14′ 6" tall. Very large loads can also require police escorts.

Every state requires “OVERSIZE LOAD” signs (black letters on yellow) on permitted oversize loads, but sizes and placement vary. Red or fluorescent orange flags, typically at least 12 inches square, mark the corners of a wide load and the end of a rear overhang of 4′ 0" or more. At night, projecting loads need lamps, and escort vehicles typically use amber warning lights. Check each state’s rules and your permit.

Usually, yes. Many states limit oversize loads to daylight hours; Texas, for example, allows travel from 30 minutes before sunrise to 30 minutes after sunset unless the permit says otherwise. Many states also restrict holidays, weekends or rush hours. California applies curfews to loads over 10′ 0" wide in its biggest metro areas. Your permit lists the hours and dates you can move.

A superload is a load big or heavy enough to go past a state’s routine permit limits, and every state defines it differently. Oregon, for example, treats loads over 17′ 0" high or 150′ 0" long, or over 16′ 0" wide on multi-lane highways, as superloads. California requires special processing above 15′ 0" wide, 17′ 0" high or 135′ 0" long. Expect route surveys, extra review and more lead time.

A single-trip permit covers one load on one route for a short window, such as 7 consecutive days in California or up to 10 days in Oregon. An annual permit covers repeat moves for a year, but only within set limits; California’s annual permit, for example, tops out at 12′ 0" wide and 14′ 0" high. Many machinery moves use single-trip permits because each load and route is different.

It depends on the state and the load. Many states sell permits online through self-service systems, such as Oregon’s ORION and California’s CTPS. Bigger moves take longer: Oregon says a superload permit can take up to 10 days, and California asks for variance requests at least 30 days ahead. The motor carrier hauling the load typically obtains the permit, either directly or through a permit service.

Each state on the route issues its own permit, so a move through three states typically needs three permits, each with its own rules. Width, height, escort and travel-time limits can change at each state line, so the route, trailer and escorts have to work for every state on the trip.

The Abound team plans the trailer, route and permits with you, then arranges the move through our vetted carrier network. Abound Transport Group is an authorized agency of Armstrong Transport Group (MC-555609 / USDOT 2236080). We are not a carrier or a permit authority; permits are issued by each state to the hauling carrier.

Choose Length, Width or Height, then drag the slider or tap a tier to grow the load. As it grows, the tool shows when a permit is needed and when banners, flags, lights, pilot cars, a height pole or police escorts come in. The numbers are typical national tiers for planning only; each state sets its own limits, so check your state on the map.

Each button sets a typical deck height and length. In Height mode, a lower deck leaves more room for freight under the legal limit: about 60 inches for a flatbed, 40 to 42 inches for a step deck, 30 to 34 inches for a low pro step deck, 18 to 24 inches in an RGN well and 36 to 40 inches for a hotshot. In Length mode, a hotshot deck is about 40′ 0", and an RGN well is about 26′ 0" before it needs an insert or extension.