Dooring is a traffic collision in which a cyclist rides into a car door or is struck by a car door that was opened quickly without checking first for cyclists by using the side mirror and/or performing a proper shoulder check out and back.
The width of the door zone in which this can happen varies, depending upon the model of car one is passing. The zone can be almost zero for a vehicle with gull-wing doors or much larger for a truck. Dooring can happen when a driver has parked and is exiting their vehicle, or when passengers are exiting from cars, taxis and ride shares into the path of a cyclist approaching from the rear.
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The Daily Omnivore 