How many demerit points are assigned for the improper opening of vehicle doors?

The assignment of demerit points for the improper opening of vehicle doors is based on the potential danger it poses to other road users. When a driver opens a vehicle door without ensuring that it's safe to do so, it can lead to accidents, particularly to cyclists or pedestrians who may be passing by. This action is viewed seriously as it endangers the safety of others on the road.

The correct answer reflects the severity of this traffic violation by indicating that it carries a penalty of three demerit points. This system of demerit points is part of Ontario’s strategy to encourage safe driving behaviors. More serious offenses have higher point assignments, while less critical actions, which might still be hazardous, receive fewer points. In this case, the improper opening of a vehicle door carries a notable risk, justifying a more significant penalty in the point system.