Under what circumstances is it acceptable to pass on the right?

Passing on the right is acceptable when another vehicle is making a left turn and it is safe to do so. This is a fundamental traffic rule that helps maintain a smooth flow of traffic and ensures safety. When a vehicle signals its intention to turn left, it creates an opportunity for other vehicles to pass on the right, provided there is enough space, and it is clear of any obstacles or pedestrians.

In many situations, it is crucial for drivers to use caution and remain aware of their surroundings before executing such a maneuver. Passing on the right in this context prevents unnecessary delays and encourages efficient traffic movement.

The other options may create unsafe situations or misunderstandings. For example, passing on the right just because another vehicle is moving slowly does not account for the legality of that action or the potential risk involved. Similarly, passing on the right because of blocking in the left lane might not be safe or permissible if it disrupts the flow of traffic or violates other traffic laws. Lastly, stating that passing on the right is always allowed ignores that there are specific regulations governing this action to ensure driver safety.