Maryland Truck Lane Restrictions
Maryland has no statewide truck-lane ban, but posted signs are binding. Md. Transp. 21-309(f) says a truck, tractor, trailer, or bus on a road with two or more lanes each way must obey any lane-designation sign, so where MDOT SHA posts 'Trucks Use Right Lane,' you follow it. Elsewhere it's the general keep-right rule (21-301(b)).
Which lanes a truck can use in Maryland
Maryland has no statewide truck-lane ban, but posted signs are binding. Md. Transp. 21-309(f) says a truck, tractor, trailer, or bus on a road with two or more lanes each way must obey any lane-designation sign, so where MDOT SHA posts 'Trucks Use Right Lane,' you follow it. Elsewhere it's the general keep-right rule (21-301(b)).
Roads, exceptions, and signs
- Where it applies: Signed corridors on multi-lane highways. Applies where posted, not statewide.
- Posted 'Trucks Use Right Lane' (R4-5), binding under 21-309(f).
- General rule: The general keep-right rule for all vehicles is Md. Transp. 21-301(b).
- The enabling statute (21-309(f)) makes the posted signs enforceable, so treat any 'Trucks Use Right Lane' sign as binding.
What a lane violation costs
A traffic violation with a court-set fine; the posted sign carries the force of law.
Maryland Truck Lane FAQ
Can a truck drive in the left lane in Maryland?
Is there a truck lane restriction in Maryland?
What is the fine for a lane violation in Maryland?
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 Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it.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://codes.findlaw.com/md/transportation/md-code-trans-sect-21-309/. See our Terms & Disclaimer.
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