Washington Truck Speed Limit
Trucks top out at 60 mph anywhere in Washington. Cars run 70 on rural interstates and 75 on posted I-90 segments, but any vehicle over 10,000 lb gross or any combination stays at 60 (RCW 46.61.410). That gap widens to 15 mph on the 75 stretches. The cap is statewide, not just the interstates.
How fast a truck can run in Washington
Trucks top out at 60 mph anywhere in Washington. Cars run 70 on rural interstates and 75 on posted I-90 segments, but any vehicle over 10,000 lb gross or any combination stays at 60 (RCW 46.61.410). That gap widens to 15 mph on the 75 stretches. The cap is statewide, not just the interstates.
Truck-specific rules and quirks
- Keep right except to pass (RCW 46.61.100). Trucks stay out of the far-left lane on multi-lane freeways.
- The 60 mph cap covers every vehicle over 10,000 lb gross weight and all combinations except auto stages (RCW 46.61.410). It holds even where cars are posted 75.
What a speeding ticket costs
Speeding fines are graduated by mph over and set by the state fee schedule. In a work zone the penalty doubles and can reach $1,000, and a second work-zone offense can pull your license (RCW 46.61.527).
Washington Truck Speed Limit FAQ
What is the truck speed limit in Washington?
Do trucks have a lower speed limit than cars in Washington?
What is the speeding penalty for a truck in Washington?
Reference information for planning, not legal advice. Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it. Last reviewed July 2026. Source: https://app.leg.wa.gov/rcw/default.aspx?cite=46.61.410. See our Terms & Disclaimer.
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