When another vehicle is passing on the left, what should you do?

When another vehicle is passing on the left, the appropriate action is to slow down and allow the other vehicle to pass safely. This choice is crucial for maintaining safety on the road. By reducing your speed, you create a safer environment for everyone involved, which minimizes the risk of collisions. It also shows consideration for the other driver’s maneuver and can prevent situations that might lead to dangerous outcomes, such as sideswiping or cutting off the passing vehicle.

Honing your horn, while helpful in some contexts, is not necessary in this situation and can actually add to confusion. Speeding up may lead to misjudgments about distance and speed, increasing the likelihood of an accident. Moving to the right shoulder could be dangerous unless it is a proper exit or there’s an emergency situation, as it might disrupt the flow of traffic and not provide the passing vehicle adequate space to do so safely. Thus, slowing down provides a clear and safe path for the passing vehicle.