Passenger vehicles should wait for what?

In this scenario, the correct choice is that passenger vehicles should wait until a larger vehicle has completed turning. Larger vehicles, such as trucks or buses, often require more space and time to make turns safely due to their size. Therefore, it is generally prudent for smaller vehicles to allow these larger vehicles to complete their maneuvers before proceeding. This helps prevent potential accidents that could occur if a smaller vehicle tried to squeeze past a larger one that is in the process of turning.

The other situations, while also important for general driving safety, do not specifically address the unique challenges posed by larger vehicles during turning. For example, waiting for a green light or a gap in traffic is common practice, but it is not as critical as ensuring the path is clear when a larger vehicle is involved in a turn. Additionally, while waiting for all pedestrians to cross is crucial for pedestrian safety, it does not pertain directly to the interactions between passenger vehicles and larger vehicles. Thus, recognizing the need to allow larger vehicles the right of way during turns is essential for safe driving.