When are three-point turns prohibited?

Answer: B — On busy roads or where visibility is limited

The prohibition of three-point turns on busy roads or where visibility is limited is based on safety considerations. Three-point turns require significant maneuvering space and can take time to execute, which may block traffic if done in a high-traffic area. Additionally, poor visibility can make it challenging for the driver to assess oncoming vehicles and pedestrians, increasing the risk of collisions. In situations like busy roads, such turns could lead to accidents due to a driver's inability to see approaching traffic or pedestrians, as well as creating disruption to the normal flow of traffic that could lead to further safety hazards. Therefore, drivers should opt for safer alternatives, such as going around the block or using designated turnaround areas, to avoid the potential dangers associated with three-point turns under these conditions.