This guide is for general information only and is not legal advice. Laws change — verify current rules with your state DOT or a licensed attorney before relying on this for any legal matter. Read full disclaimer.
The rule
In Maryland, the standard DUI statute applies to bicyclists. Md. Transp. § 21-1202 makes a person riding a bicycle subject to all the duties applicable to the driver of a vehicle, and Maryland's DUI statute (Md. Transp. § 21-902) applies to anyone driving or attempting to drive 'any vehicle' while under the influence. Maryland courts have applied DUI to cyclists, with penalties identical to motor-vehicle DUI — fines up to $1,000, possible jail time, and points on a driver's licence even though no motor vehicle was involved. See Md. Transp. § 21-1202 (Application of traffic laws to bicycles).
Riding a bicycle while impaired is a real legal exposure in Maryland. If you've been drinking, the safer move is to walk your bike, take transit, or call a ride.