When do drivers of other vehicles pose hazards to motorcycle riders?

Drivers of other vehicles pose significant hazards to motorcycle riders when passing a row of parked cars primarily due to the potential for unexpected movements from parked vehicles. Parked cars may have passengers who can suddenly open doors, also known as "dooring," which can create a sudden and dangerous obstacle for motorcyclists. Additionally, drivers in parked cars may pull out into traffic without checking adequately for oncoming motorcycles, leading to collisions.

While adverse weather conditions and scenarios like riding in a straight line or being stopped at a traffic light can present their own challenges, the threat from parked vehicles is particularly acute because of the unpredictability of other drivers' actions in this context. Riders need to stay vigilant and anticipate these hazards when navigating areas with parked cars to prevent accidents.