Which of the following situations is ideal for overtaking and passing another vehicle on the right?

Overtaking and passing another vehicle on the right is appropriate when the vehicle you are passing is preparing to make a left turn. In this scenario, the vehicle is signaling its intention to turn left, which creates an opportunity for another vehicle to safely pass on the right. This is particularly important because, in many cases, vehicles going straight may be blocked or slowed down by those turning left, allowing for a legal maneuver if there is enough space and it is safe to do so.

Other situations, such as passing a vehicle when it is traveling at a lower speed or stopped at a red light, do not provide a clear and legal pathway for overtaking on the right. Similarly, a vehicle signaling to merge left indicates that it may soon be changing lanes into that space, which could create confusion or a potential collision if another vehicle attempts to pass on the right at that moment. Therefore, the action of passing on the right should be done primarily when the vehicle in the left lane is clearly and safely turning, as indicated in the correct choice.