Riding beside a line of parked cars may be dangerous because:

Riding beside a line of parked cars can pose significant hazards, and one of the most critical dangers is the potential for someone inside a car to open the door unexpectedly. This situation, commonly referred to as "dooring," can lead to severe accidents, as a motorcyclist may not have sufficient time to react upon encountering an open door.

While reduced visibility and the risk of colliding with a parked car are indeed important factors to consider in this scenario, the specific risk associated with someone unexpectedly opening a car door represents an immediate and acute threat. A rider needs to be especially vigilant in this context, maintaining an appropriate distance from parked vehicles to provide enough reaction time and space to maneuver if necessary. This awareness is essential for safe riding practices and avoiding accidents in such environments.