Oversize in Washington: what triggers a permit, and what triggers escorts

Notes from the yard — published September 3, 2026 by the dispatch desk at Long Road Transportation.

The line where legal ends

A load needs a permit in Washington once it exceeds any one of three numbers: 8 feet 6 inches wide, 14 feet high, or 80,000 pounds gross. Exceed one of them and the whole move becomes permitted — there is no partial version.

The height figure catches people out, because 14 feet is the Washington statute while most interstate routing is planned to 13'6". A load that is legal at home can be oversize the moment it leaves the state, which is why routing is settled before a rate is quoted, not after.

What actually counts as an escort vehicle

A pilot car is not just a pickup with a light bar. Washington defines the vehicle itself: a single-unit passenger car, passenger van, or two-axle truck, including a non-placarded service truck, and no more than 16,000 pounds gross weight or gross weight rating.

The operator matters as much as the vehicle. An operator holding a Washington driver licence has to carry a valid Washington pilot escort vehicle operator certificate card while working. Getting it means an eight-hour initial course from a WSDOT-approved provider, or a four-hour recertification, plus a written test passed at 80 percent or better.

The hours the load is allowed to move

Permitted loads do not run on the shipper's schedule. They run on the state's:

• Standard travel runs from half an hour before sunrise to half an hour after sunset.
• Weekend travel is allowed for loads under 10 feet wide and 105 feet long. Above that, the weekend is not available.
• No travel on major holidays, and nothing after 12:00 noon on the preceding weekday.
• Individual permits can be stricter than the general rule — the conditions printed on the permit win.

In practice this is what turns a 300-mile oversize run into a two-day move. Planning it as a one-day run and discovering the holiday cut-off on the afternoon before is the single most common way an oversize schedule collapses.

How we quote it

An oversize rate is the truck, the permits, the escorts and the days, and the last three are driven entirely by the dimensions. Send the as-loaded length, width, height and weight, both addresses, and any known constraint at either end — a low bridge, a tight gate, a site with no crane.

The trailer follows from those numbers, and that decision is worked through in RGN, step deck or flatbed. Both ends of the job — the permits and the deck — are handled in-house, on our own heavy-haul equipment out of Kent and Tacoma.

Questions we get asked

At what size does a load need a permit in Washington?

Over 8 feet 6 inches wide, over 14 feet high, or over 80,000 pounds gross. Any one of the three is enough.

Can any vehicle be used as a pilot car?

No. It has to be a single-unit passenger car, passenger van, or two-axle truck, non-placarded, at 16,000 pounds gross weight or rating and under, driven by a certified escort operator.

Can an oversize load travel at night or on a Sunday?

Standard travel is daylight only, from half an hour before sunrise to half an hour after sunset. Weekend travel is limited to loads under 10 feet wide and 105 feet long, and holidays are closed.

Read next

• RGN, step deck or flatbed: picking the deck before you measure twice
• Hazmat placards: Table 1, Table 2 and the 1,001-pound rule

Long Road Transportation is an asset-based carrier operating its own trucks, chassis and heavy-haul equipment out of Kent and Tacoma, Washington. USDOT 3388302, MC 113242, SCAC LRDP.