Dooring and Bike Lanes: What Maryland Law Says When a Car Door Takes Down a Cyclist
It happens in a half-second. A cyclist is riding lawfully along a line of parked cars — often in a marked bike lane — and a driver's door swings open directly into their path. The rider has no time to brake and nowhere to go: swerve left into moving traffic, or hit the door. Cyclists call it "dooring," and it is one of the most common serious bike crashes in Maryland's cities.
The good news for injured riders: Maryland law is unusually clear about whose fault this is.
The dooring statute
Maryland Transportation Code § 21-1105 says that a person may not open the door of a motor vehicle on the side available to moving traffic unless (1) it is reasonably safe to do so and (2) it can be done without interfering with the movement of other traffic. The statute also prohibits leaving a door open on the traffic side longer than necessary to load or unload passengers.
Notice what that rule does: it puts the burden of looking on the person opening the door, not on the cyclist. A rider proceeding lawfully in a bike lane or beside parked cars is "moving traffic." A driver or passenger who flings a door open without checking their mirror has violated the statute in the act of causing the crash.
Under Maryland law, the violation of a statute designed to protect a class of persons can itself supply evidence of negligence — the same statute-or-ordinance principle the Court of Appeals applied in Blackburn Limited Partnership v. Paul, 438 Md. 100 (2014). A dooring case therefore usually begins with liability strongly in the injured cyclist's favor: the statute defines the duty, and the crash itself tends to prove the breach.
The rest of the rulebook
Dooring is not the only protection Maryland gives cyclists:
| Rule | What it requires |
|---|---|
| Door statute (§ 21-1105) | No opening a door into traffic unless reasonably safe and non-interfering |
| Three-foot passing rule (§ 21-1209) | Drivers must generally give at least 3 feet of clearance when passing a cyclist |
| Bike lanes (§ 21-1209(d)) | A driver about to enter or cross a designated bike lane or shoulder must yield the right of way to a cyclist lawfully riding in it |
| Cyclists' road rights (§ 21-1202) | Cyclists generally have the rights and duties of vehicle drivers |
The contributory negligence problem — and why dooring cases survive it
Maryland remains one of the last jurisdictions in America where contributory negligence is a complete defense: if the injured person's own negligence contributed at all to the crash, recovery is barred. The Court of Appeals reaffirmed that rule in Coleman v. Soccer Association of Columbia, 432 Md. 679 (2013), and every insurer in the state leans on it.
Expect the adjuster to argue the cyclist was riding too fast, too close to the parked cars, or outside the bike lane. Here is why those arguments usually fail in a genuine dooring case: the law does not require cyclists to anticipate that a door will be thrown into their path in violation of a statute. Riding a predictable, lawful line near parked cars is exactly what cyclists are supposed to do — indeed, riders are often required to stay to the right. When the door opens into that lawful line of travel, the statutory violation belongs entirely to the door-opener.
One more point: Maryland's bicycle helmet statute, Md. Transp. § 21-1207.1, requires helmets only for riders under 16 — and even that requirement is enforced with warnings and educational materials rather than fines. Riders 16 and older have no legal duty to wear a helmet, a fact worth remembering if an adjuster tries to turn a missing helmet into a fault argument.
Building the case
Dooring cases are won with details gathered early:
- The door-opener's own statement. "I didn't see him" is an admission that they did not look — which is the whole case.
- The police report and citation. Officers familiar with § 21-1105 often cite the driver at the scene.
- Scene photographs. The door's position, the bike lane markings, the debris field.
- Rideshare records. A striking number of doorings involve passengers exiting Ubers and Lyfts mid-block; the trip data identifies the vehicle and the account holder.
- Prompt medical documentation. Dooring injuries — broken clavicles, wrist fractures, facial and dental injuries, head trauma — need to be tied to the crash from day one.
What this means for injured people in Maryland
If you were doored, do not accept an adjuster's suggestion that "cyclists assume the risk" of riding in the city. Maryland law says the opposite: the person opening the door bears the duty to make sure it is safe. With a clear statute, a supportive police report, and early evidence preservation, dooring cases are among the stronger cyclist claims in a state whose fault rules are otherwise unforgiving.
If you or a loved one has been hurt, call Posey Lebowitz at (202) 524-0123 or send us a message for a free consultation.
Part of our DMV case law archive, compiled in 2026 to reflect the archive of some of the most important decisions in injury law.