Washington 5 Axle Semi Truck Size and Weight Limits

Washington: 5 Axle Semi Truck

semi truck tractor trailer

Gross Weight Limits

Ruleset Jurisdication Permit Required? Estimated Gross *
WA Law Interstate and Designated No 85,500 lbs

* This is an estimate as it does not include bridge and tire compliance.

Axle Weight Limits

Ruleset: WA Law

Jurisdication: Interstate and Designated

Axle Group Tire Type Axle Spread Axle Weight Limit
Steer AxleSingle 20,000 lbs
Tandem DrivesDuals40 - 96 in 34,000 lbs
Trailer TandemDuals40 - 96 in 34,000 lbs
Trailer TandemDuals96 - 108 in 38,000 lbs
Trailer TandemDuals108 - 120 in 39,000 lbs
Trailer TandemDuals120 - 121 in 40,000 lbs

Dimension Restrictions

Interstate and Designated
Dimension NameMinMax
Overall Height14' 0"
Overall LengthNo Limit
Overall Width8' 6"
Front Overhang3' 0"
Rear Overhang15' 0" Max - Measured from center of rearmost axle to end of load
Semi-Trailer Length56' 0" Max - Permit required over 53'
Semi-Trailer WheelbaseNone Specified



These figures are interpreted from the legal codes freely available, please read our full disclaimer and inform us of any errors!