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Washington DOT Regulations for Oversize/Overweight Load Flags/Banners/Signs/Lights, Running Hours and Holiday Restrictions

For All State Regulations, See:

Washington Oversize / Overweight Regulations

Running Hours and Holiday Restrictions

One half hour before sunrise to one-half hour after sunset, including Saturdays and Sundays. In addition, vehicle/loads not exceeding 12′ wide, 14’6″ high and 105′ long, including legal overhangs, may run at night with proper lighting defined by Federal Regulations 49 CFR 393.11 Monday through Friday time/width curfew restrictions for the vicinities of Seattle-Everett, Tacoma, Olympia, Vancouver and Kelso are listed on the Commuter Curfew Hours sheet which accompanies permits. Movement on state highways is restricted on the holidays of New Year's Day, Memorial Day, Independence Day, Labor Day, Thanksgiving, and Christmas, and commencing at noon of the day preceding said holidays.

"Oversized Load" Banner Regulations and Requirements

“Oversize Load” signs are required for all oversized loads at the front of the tractor at a height of 5′ from ground level (or as high as practicable on the vehicle or load if it cannot accommodate the 5′ height), and at the rear of the vehicle. Signs must be 7 feet long and 18 inches high with black lettering at least 10 inches high on a yellow background. 

Flag Requirements

Flags must be displayed on all four corners of all overwidth loads, and at the extreme ends of all protrusions, projections, or overhangs. 

Warning Lights: Color and Placement

When night movement is allowed, loads projecting beyond the sides of the vehicle must have amber lights visible from the front and side at the outermost extremities. Rearmost edge(s) of the projecting load must be marked with a red lamp visible from the rear and side.

Source of Information:

Washington State DOT - Oversize and Overweight Permits

What is considered as "Oversized Load" in Washington?

Dimensions: Width: 8' 6" (8' Local roads) Height: 14' Semi-trailer: 53'

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