The door zone is the space spanning about four feet (1.2m) from the sides of parallel parked cars. It is hazardous to ride a bicycle or motorcycle in a door zone because if a door is suddenly opened, the cyclist must either crash into it (suffering a dooring), brake suddenly, or swerve into the adjacent lane of traffic. An opening door may also knock the cyclist into passing traffic, leading to serious injuries or death. Despite this hazard, bicycle lanes or cycle lanes are often painted within door zones.
Read more about Door Zone: Legal Issues, Avoidance, Prevalence
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