When is passing another vehicle prohibited?

Passing another vehicle is prohibited when the traffic situation is unclear because safety is the top priority on the road. Unclear traffic conditions can lead to unpredictable behavior from other drivers and potential hazards that may not be immediately visible, such as pedestrians, cyclists, or sudden changes in road conditions. It is crucial for drivers to maintain a comprehensive awareness of their surroundings before deciding to pass another vehicle, as uncertain situations can increase the risk of accidents.

While the other options may suggest scenarios where passing could be easier or legally permissible, they do not address the critical aspect of safety in unclear situations. For example, a broken center line generally indicates that passing is allowed, and being able to pass without exceeding the speed limit or having no other vehicles nearby does not guarantee that it is safe to do so if the traffic situation itself is ambiguous or suspect. Thus, prioritizing a clear understanding of traffic conditions is essential for safe driving practices.