Montana Truck Lane Restrictions
Montana has no truck-specific left-lane ban. You follow the general keep-right rule (MCA 61-8-321). On any road with two or more lanes your way, stay in the right lane except to pass or when you're moving faster than the flow. A violation is a misdemeanor with a fine from $10 to $500.
Which lanes a truck can use in Montana
Montana has no truck-specific left-lane ban. You follow the general keep-right rule (MCA 61-8-321). On any road with two or more lanes your way, stay in the right lane except to pass or when you're moving faster than the flow. A violation is a misdemeanor with a fine from $10 to $500.
Roads, exceptions, and signs
- Where it applies: Statewide, all multi-lane roadways. Not truck-specific.
- General rule: MCA 61-8-321 — drive on the right; keep right on two-or-more-lane roads except to pass.
- Montana's keep-right for 2+ lane roads is fairly strict, but it applies to all vehicles, not just trucks.
What a lane violation costs
Misdemeanor traffic violation. General penalty runs $10 to $500 (MCA 61-8-711).
Montana Truck Lane FAQ
Can a truck drive in the left lane in Montana?
Is there a truck lane restriction in Montana?
What is the fine for a lane violation in Montana?
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 Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it.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://mca.legmt.gov/bills/mca/title_0610/chapter_0080/part_0030/section_0210/0610-0080-0030-0210.html. See our Terms & Disclaimer.
More for Montana
Check Montana before you roll
Live weather, closures, and hazards on one map. Free, no account.
Open Live Map →