As someone who got doored once – low speed thankfully, just bruises and a bent derailleur – I learned everything about the door zone the lucky way. A friend wasn’t as fortunate: broken collarbone, weeks off the bike, lasting shoulder problems. The door zone kills.
Understanding the Door Zone
That’s what makes this danger so predictable – the zone extends 3-4 feet from any parked car. An opened door fills this space completely. Ride outside it. Period. Even if positioning yourself there puts you “in traffic.”
Being in the travel lane feels scary but it’s predictable. Cars behind you see you and react accordingly. Doors swing open without any warning whatsoever.
Warning Signs to Watch For
Brake lights on a parked car mean someone just stopped there. Heads moving inside vehicles. Taxi and rideshare passengers getting ready to exit. Anyone visible in the driver’s seat.
Probably should have led with this: never trust that people will look before opening doors. They simply won’t.
Proper Lane Position
Claim enough of the lane that cars must pass you properly – swinging around rather than squeezing alongside. Timid riding hugging the parked car line invites dangerously close passes AND keeps you directly in the kill zone.
Taking the lane when it’s too narrow to share safely is legal in most places. That right exists for exactly this situation.
The Slow Speed Danger
Congested traffic actually increases risk, not decreases it. Less time to react, but doors open just as quickly. Stay especially alert when creeping past parked cars in stop-and-go situations.
When It’s About to Happen
Swerving into active traffic is usually worse than hitting the door. If you can’t avoid contact, try to hit the door squarely rather than glancing off and losing control into traffic.
Afterward: get the driver’s information, photograph all damage, file a police report if there are any injuries. Dooring is illegal in most jurisdictions. The driver is at fault regardless of whether you were in a bike lane.
Making It Automatic
Every parked car represents a potential door. Scan constantly. Give space automatically. Build the habit into muscle memory so the protection happens without conscious thought.
