Washington Truck Lane Restrictions

Washington holds trucks to the right by statute, statewide (RCW 46.61.100). Any vehicle over 10,000 lb must use the right-hand lane on a road with two or more lanes each way, moving left only to pass, merge, or turn. And on a limited-access freeway with three or more lanes each way, a truck over 10,000 lb or anything towing a trailer is barred from the far-left lane. No sign needed - WSP enforces it.

Rule typeStatewide

The ruleTwo statewide truck rules

FineA traffic infraction; WSP Commercial Vehicle Enforcement writes it.

StatuteRCW 46.61.100 (2) and (3)

01 The rule

Which lanes a truck can use in Washington

02 Where & when

Roads, exceptions, and signs

Where it applies: The right-lane rule covers any 2+ lane road; the far-left-lane ban covers 3+ lane freeways. Statewide, no sign needed.
Statutory statewide.
General rule: The general slower-traffic keep-right is also in RCW 46.61.100.
The two tiers use different lane thresholds - right lane on 2+ lane roads if you're over 10,000 lb; off the far-left lane on 3+ lane freeways if you're over 10,000 lb or towing.

03 Penalties

What a lane violation costs

A traffic infraction; WSP Commercial Vehicle Enforcement writes it.

Washington Truck Lane FAQ

Can a truck drive in the left lane in Washington?

Not as a cruising lane. Two statewide truck rules (RCW 46.61.100). Any vehicle or combination over 10,000 lb must use the right-hand lane on a road with two or more lanes each way (you may still move left to pass, to go faster than traffic, to merge, or to turn left). Separately, a vehicle towing a trailer or over 10,000 lb may not use the far-left lane of a limited-access road with three or more lanes each way.. See RCW 46.61.100 (2) and (3). You may still use it to pass, turn left, or when directed.

Is there a truck lane restriction in Washington?

Yes. Two statewide truck rules (RCW 46.61.100). Any vehicle or combination over 10,000 lb must use the right-hand lane on a road with two or more lanes each way (you may still move left to pass, to go faster than traffic, to merge, or to turn left). Separately, a vehicle towing a trailer or over 10,000 lb may not use the far-left lane of a limited-access road with three or more lanes each way. It applies on The right-lane rule covers any 2+ lane road; the far-left-lane ban covers 3+ lane freeways. Statewide, no sign needed..

What is the fine for a lane violation in Washington?

A traffic infraction; WSP Commercial Vehicle Enforcement writes it.

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=46.61.100. See our Terms & Disclaimer.

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Washington Truck Lane Restrictions

Which lanes a truck can use in Washington

Roads, exceptions, and signs

What a lane violation costs

Washington Truck Lane FAQ

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