(Photograph courtesy of Wikipedia - Image is in the public domain.)
The door zone refers to the area at the side of parallel parked cars and trucks which would be intruded upon by the car door, were it to be opened. The door zone is hazardous for cyclists to ride in, since a car door often opens without warning, leaving the cyclist no opportunity to stop in time to avoid it. Bike lanes sometimes have portions that overlap the door zone. If such were the case, it would be extra hazardous for the cyclist to swerve into the car lane in order to avoid a collision, since any passing traffic would not be expecting such a maneuver. If there were no bike lane, there still may not be the expectation of such a maneuver. Worst of all is the case where the opening car door directly knocks the cyclist into passing traffic; fatalities due to such have occurred.
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