dooring

Dooring is a road hazard that occurs when a vehicle door is opened into the path of an oncoming cyclist or other road user. The opening door can create an obstacle in the travel lane or strike a rider traveling beside the parked car. Dooring is most common on urban streets with parallel parking and some level of traffic.

Most dooring incidents happen when a driver or passenger opens a door without noticing an approaching cyclist. The door extends into the lane, leaving little time for evasive action. Speed, parking density, and reduced visibility increase the risk. The result can be a collision, or a rider may be forced to brake or swerve abruptly, potentially causing a fall or other injuries.

Prevention and safety measures include a few simple practices. Drivers should check for cyclists before opening doors and consider the Dutch reach—opening with the far hand and turning to look for traffic. Whenever feasible, avoid parking in bike lanes or ensure the area is clear before exiting. Cyclists can reduce risk by riding further from parked cars when possible, maintaining a predictable line, and scanning for potential door openings. Infrastructure such as protected bike lanes and door-zone markings also aims to reduce dooring incidents.

Legality and liability vary by jurisdiction. In many places, opening a car door into traffic can be treated as negligent or careless driving, with potential liability for damages or injuries. Prevention relies on both driver awareness and rider vigilance to minimize conflicts in shared road space.