What must a driver do when another vehicle attempts to pass them?

When another vehicle attempts to pass, the appropriate action for a driver is to allow them to do so safely. This is crucial for maintaining safe driving dynamics and preventing potential accidents. By yielding to the passing vehicle, the driver helps to ensure that the maneuver can be completed without interference, thus promoting safer road conditions for everyone involved.

Speeding up to prevent someone from passing or changing lanes unnecessarily can create dangerous situations, including the risk of collisions. Honking to alert the other driver might not be productive and can lead to confusion or road rage. Therefore, the correct approach is to provide the passing vehicle enough space and time to complete the maneuver safely.