Car drivers/riders, please check behind you before you open a car door. You could seriously hurt a cyclist.
Bicycle drivers, please don't move through the door zone. Even though the car user is violating a law when they open a door in front of you, it's a risk you do not need to take, for your safety or to comply with laws. The law does not compel a cyclist to stay so far right as to be in the door zone, and it's not a good idea in any case.