A driver may pass on the right of another vehicle in which of these situations?

When a motor vehicle ahead is making or about to make a left turn, it is permissible for a driver to pass on the right. This situation creates an opportunity where the vehicle is temporarily out of the travel lane, allowing room for another vehicle to maneuver around it safely. Passing on the right in this context is not only legal but also often necessary to maintain traffic flow. It's important for drivers to watch for signals indicating that the vehicle ahead is turning, as this informs them that passing on the right is safe at that moment.

The other scenarios either do not provide a legal basis for passing on the right or may involve conditions that could create potential hazards. For instance, a narrow road situation may not allow safe passing at all, while passing in a parking lot could involve unpredictable movements from parked vehicles and pedestrians, increasing the risk of accidents. Additionally, simply driving under the speed limit does not justify passing on the right, as speed limits serve safety and traffic flow purposes, but they do not relate to the legality of passing maneuvers.