Matthew Baldwin:

Every time drivers are parked on the curb and open their driver’s side door without first checking their side- or rear-view mirror, they run the risk of dooring a cyclist: striking them as they pass and knocking them into traffic, or abruptly placing the door unavoidably in their path such that they collide with it at full speed. Either way, it’s what we in the business refer to as a “huge bummer” for all involved.

Dooring is also one of the easiest oh-rats-I-just-killed-a-cyclist scenarios to avoid: Whenever you’re parked on the side of a road, check your mirrors to ensure no one is approaching before you open your door.

Great advice on how to not kill a cyclist.