Which action should be avoided to ensure safety when parking a vehicle?

Opening the door with your left hand is the correct action to avoid when parking a vehicle because this action can inadvertently lead to unsafe situations. When drivers use their left hand to open the vehicle door, they may have a less clear view of oncoming traffic on the driver's side. This can result in them not noticing a cyclist or vehicle approaching from behind, increasing the risk of an accident.

In contrast, using turn signals, observing traffic before exiting, and engaging the parking brake are all safe practices. Turn signals help communicate intentions to other drivers, enhancing safety. Observing traffic before exiting the vehicle ensures that the area is clear of hazards. Engaging the parking brake secures the vehicle in place, preventing it from rolling away, especially on inclines. These actions collectively contribute to safer parking and exiting procedures.