Washington State oversize/overweight (OS/OW) permit regulations

Sept. 30, 2025, 6:22 p.m.
Legal (Standard) Limits Without Permit
Washington State oversize/overweight (OS/OW) permit regulations

If your vehicle/combination/load stays within these dimensions and weights, a permit is not required:

Parameter Limit / Description
Width 8′‑6″ 
Height 14′ 
Semi‑trailer length 53′ 
Single unit length 40′ 
Overall length (truck + trailer) 75′ 
Front overhang 3′ from bumper line 
Rear overhang 15′ from center of last axle to end of load

 

Gross Vehicle Weight (GVW)

Standard legal weight chart (depends on number of axles, spacing, etc.)