What should drivers be cautious of when passing parked vehicles?

Being cautious of signs of a person exiting a vehicle is crucial when passing parked vehicles because individuals may unexpectedly open a door, step out into the roadway, or move in front of your vehicle without warning. Drivers should remain vigilant for any cues that someone might be getting out, such as a door ajar, movement inside the vehicle, or even a person standing near the vehicle.

This precaution is especially important in urban areas where parked cars line the streets and people frequently enter or exit their vehicles. Noticing these signs allows drivers to react appropriately, either by slowing down or being prepared to stop, reducing the risk of accidents with pedestrians.

While the other options involve elements that a driver should be aware of, they don't emphasize the immediate risk associated with people exiting parked vehicles, which is a common cause of collisions in these situations.