Wisconsin Truck Lane Restrictions

Which lanes a truck can use in Wisconsin

Wisconsin has no truck-specific left-lane law. The rule is the same one that covers every driver: keep right if you're slower than traffic, and use the left lane only to pass or turn (Wis. Stat. 346.05). On a three-lane road you stay right unless you're passing. A ticket runs $30 to $300 plus costs. There's no weight cutoff and no "trucks use the right two lanes" ban.

Roads, exceptions, and signs

• Where it applies: All roadways statewide. There is no weight or truck-class trigger.
• "Slower traffic keep right" signs are posted, but there is no "trucks use right lanes" truck restriction.
• General rule: Wis. Stat. 346.05 - slower-than-traffic vehicles keep right; on three-lane highways all traffic keeps right except to pass or turn.
• Wisconsin's keep-right law is measured against actual surrounding traffic, not the posted limit. No truck weight cutoff exists anywhere in Chapter 346.

What a lane violation costs

Forfeiture of $30 to $300 plus court costs and surcharges (Wis. Stat. 346.17). It rises to $500 if the violation causes great bodily harm and $1,000 if it causes a death.

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