When is the only appropriate time to pass a vehicle on the right?

Passing a vehicle on the right is appropriate when the vehicle in front is making or about to make a left turn. This situation arises because the vehicle intending to turn left is occupying the lane to the left, creating an opportunity for you to pass safely on the right side. It is a commonly accepted traffic maneuver that allows for efficient flow and can help prevent unnecessary delays when traffic conditions allow it to be done safely.

In this scenario, the left-turning vehicle creates a clear path to the right side where you can maneuver without violating traffic laws or putting other road users at risk. It's important to ensure that the right lane is clear and that no pedestrians or other obstacles impede your path while performing this action.

Other situations, such as passing on a single lane road or when the road is clear of any signs, do not accurately justify passing on the right. Simply being in a slower moving lane does not guarantee safety and legality for passing in that manner, making it crucial to adhere strictly to proper passing protocols.