2021 Washington state shipping laws, regulations, and limitations for heavy-haul trucking and oversize loads.

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Maximum legal limits without requiring a permit.

Maximum legal limits. Standard Metric
Length: 75 feet. 22.8 meters.
Width: 8 feet, 6 inches. 2.6 meters.
Height: 14 feet. 4.2 meters.
Weight: 80,000 pounds. 36,287 kilograms.
Overhang: 15 feet from the rear, 3 feet from the front. 4.5 meters from the rear, 91 cm from the front.
Notes: Rear overhang is measured from the center to the rear axles. The front is measured from the bumper.

Washington maximum limit information details.

Routinely issued oversize/overweight permit maximums.

Oversize/overweight transport/trucking permits routinely issued by Washington WSDOT.

Maximum routine permit limits Standard Metric
Length: Case-by-case basis.
Width: 14 feet on 2-lanes. 16 feet 4-lanes. 4.2 and 4.8 meters.
Height: 16 feet. 4.8 meters.
Weight: Some routes up to 200,000 pounds. 90,718 kilograms.
Overhang: 15 feet from the rear, 4 feet from the front. 4.5 meters. 91 cm.
Notes: non-divisible loads can not be made smaller or lighter. Exception: Dozers have blades detached and sitting on the trailer. No multiple blades. Loaders may have bucket detached as long as it is a pertinent piece for the loader being transported. No multiple buckets allowed.

Routinely issued oversize/overweight permit information details.

Washington overhang in-depth clarification.

Washington superload information.

Shipments in excess of the following weights/dimensions are classified as superloads in Washington.

Superload size/weight classification Standard Metric
Length: 125+ feet on some routes 38.1+ meters.
Width: 16 + feet. 4.8+ meters.
Height: 16+ feet. 4.8+ meters.
Weight: 200,000+ pounds. 90,718+ kilograms.
Overhang: 15+ feet, case-by-case. 4.5+.
Notes: Superloads have finely detailed instructions clearly printed on the official permit. Any discrepancies should be discussed with the issuing Washington superload permit office official prior to commencing movement/transport.

Washington superload information in-depth.

Permitted travel times and restrictions.

When pilot cars/escorts are required.

Pilot car/escort vehicle requirements.

Required shipment markings, signs, flags and lights.

Additional information.

Washington DOT (WSDOT) locations and contact information.

Washington WSDOT contact information and other helpful links.

Washington State Department of Transportation
921 Lakeridge Way
PO Box 47367
Olympia, WA  98504-6340


Ports of entry:
The ports do NOT issue permits in the State of Washington.
Bow Hill: (I-5 S) 360-766-6196, Plymouth: (I-82 N) 509-734-7043, Ridgefield: (I-5 N) 360-887-8231, Spokane: (I-90 W) 509-226-3366

Email: if you know of a good one please leave it below.
Help telephone line: 360-704-6340
Fax: 360-704-6350
Hours: Monday – Friday 7:00 am – 5:o0 pm.

Pacific Time Zone


See also:

Washington State trucking company directory.
Washington State pilot cars and truck escorts.
Washington heavy-haul and oversize trucking permits.

Click here for the State DOT Website for oversize and over-weight hauling permits.
Click here for Washington State road & highway conditions.

Washington cities serviced.

The information contained in these pages is research information primarily for use by oversize and overweight trucking company drivers, dispatchers, and pilot car companies. While every effort is put into maintaining the accuracy of this information you must absolutely verify this information with the Washington State DOT Permits office before commencing movement.


  1. As of June 3, 2017; Oversize loads requiring a high pole lead and are over 12′ wide, a rear pilot is also required on all multiple lane roadways. A signed copy of a single-trip permit is also required to be in the pilot car operators possession either hardcopy or electronic.

  2. 105. In length rear pilot. Add in that on 4 lane 125′ you need a pilot

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