How much does a single-trip permit cost for commercial combine harvester with duals in Washington?

Under WSDOT guidelines, single-trip oversize/overweight permits average $10.00 + mileage, depending on axle configuration and total mileage.

When is a pilot car required for commercial combine harvester with duals in Washington?

In Washington, a pilot car is triggered when width exceeds 11'0" on two-lane roads and 14'0" on four-lane interstates. Loads over 15'6" require a lead escort with a calibrated height pole.

Washington (WA) DOT COMPLIANCE WSDOT JURISDICTION

Commercial Combine Harvester with Duals Oversize Permits in Washington (2026)

Comprehensive carrier guide for transporting Commercial Combine Harvester with Duals across Washington. Review official WSDOT single-trip fees, escort trigger dimensions, curfew hours, and superload bridge thresholds.

⚡ Direct Compliance Summary (Washington DOT)

In Washington, single-trip oversize/overweight permits for Commercial Combine Harvester with Duals average $10.00 + mileage base under WSDOT jurisdiction. A front pilot car is legally mandated on two-lane highways when load width reaches 11'0" (and 14'0" on 4-lane interstates). Loads exceeding 15'6" require a certified lead escort with a calibrated height pole.

Legal Authority: Revised Code of Washington RCW 46.44.090 (WAC 468-38 WSDOT Vehicle Size and Weight)

Reviewed by Marcus Vance, PE (Lic #TX-89241)

Single-Trip Permit Fee

$10.00 + mileage

Issued by WSDOT

2-Lane Escort Trigger

11'0"

4-Lane Trigger: 14'0"

Height Pole Clearance

15'6"

Mandatory Lead Escort

Superload Threshold

200,000 lbs

Police Escort / Bridge Review

⚖️ Federal Bridge Formula B Quick Calculator (Washington Interstate Corridors)

Estimate your allowable gross vehicle weight under Federal Bridge Formula B: W = 500 [LN/(N-1) + 12N + 36].

Outer Axle Spread (L in feet):

Number of Axles (N):

🚦 Washington Travel Curfews & Operational Restrictions

Metropolitan Rush-Hour Curfews: Seattle I-5 / I-405, Tacoma, Snoqualmie Pass weather rules

Weekend Travel: Friday sunset restrictions; weekend allowed on select corridors

Safety Equipment: Slow Moving Vehicle (SMV) emblem, high-intensity amber flashers, side outrigger marker flags.

🗺️ Continuous Interstate Corridor: Bordering States for Commercial Combine Harvester with Duals

Hauling across state lines? Check escort triggers and permit rates in states directly bordering Washington:

Oregon (OR)$8.00 + Weight Table →Idaho (ID)$28.00 →

🚜 Other Specialized Haul Regulations in Washington

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