Overtaking and passing on the right is permitted only under which of the following conditions?

Overtaking and passing on the right is permitted under multiple specific conditions that ensure safety and effective traffic flow. Each of the scenarios mentioned aligns with the rules of safe driving practices.

When the overtaken vehicle is making or about to make a left turn, passing on the right becomes necessary because the vehicle's left turn places it in a position that could block other traffic attempting to maneuver around it. In this situation, it is acceptable to pass on the right to maintain the flow of traffic while avoiding any potential collision.

On a one-way street, passing on the right is naturally permissible because all vehicles are traveling in the same direction. This scenario eliminates the risk associated with oncoming traffic and allows for safer overtaking maneuvers.

Finally, on a street with unobstructed pavement that is wide enough to accommodate multiple lanes, passing on the right is allowed as well. This condition indicates that there is enough space for safe maneuvering without encroaching into another vehicle's lane on the left, thereby minimizing the chances of accidents.

Considering these conditions collectively, all scenarios fit the requirements set forth by traffic regulations, which is why overtaking and passing on the right is permitted in these cases.