Washington oversize load rules
Legal limits, pilot car requirements, travel restrictions, superload thresholds and permit fees for oversize and overweight loads in Washington.
Legal limits without a permit
| Width | 8′6″ |
|---|---|
| Height | 14′ |
| Length | 40′ single unit · 53′ semitrailer (RCW 46.44.030) |
| Weight | 105,500 lb gross maximum (RCW 46.44.041); 80,000 lb on Interstate without permit |
What Pro adds for Washington
- 6 escort rules with counts by width, height, length and road type
- 3 travel restrictions: curfews, night, weekends, holidays
- Superload thresholds and conditions
- 5 published fee lines and permit lead time
- Lane routing with miles per state and a cost breakdown
Escort (pilot car) requirements
- 6 width, height and length thresholds with the escort count for each
- Overhang and route-type conditions
Travel restrictions
- 3 restrictions: curfews, night travel, weekends and holidays
- Which ones apply to a given load size
Superloads
- Exact thresholds and what the state requires past them
- Lead times, route surveys and police escort conditions
Permit fees
- 5 published fee lines with links to the fee schedule
- Validity periods and add-on charges
Common questions
When does Washington require pilot cars?
Answer available to members. Start free or sign in.
What is a superload in Washington?
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Can oversize loads move at night in Washington?
Answer available to members. Start free or sign in.
How much is a Washington oversize permit?
Answer available to members. Start free or sign in.
Sources
- WAC 468-38-100, pilot/escort vehicle requirements
- WSDOT Superloads
- WSDOT Special Motor Vehicle Permit Regulations and Conditions (curfews, night envelope, holidays)
- RCW 46.44.0941, special permit fees
- Chapter 46.44 RCW, size, weight, load (legal limits)
- WSDOT permit types and fees
- WSDOT commercial vehicle permits (contact, self-issue)
Planning reference. Permits carry their own conditions, and city and county roads have separate rules. Confirm with the WSDOT Commercial Vehicle Services (Olympia) before moving a load. Found an error? Report it.
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