Which of the following is considered a "No Passing Zone"?

A "No Passing Zone" is established in areas where it is unsafe for vehicles to attempt to overtake others, primarily due to visibility concerns or road characteristics. When considering the selected option, areas near the top of upgrades are particularly dangerous for passing because drivers have limited visibility of the road ahead. This curvature of the terrain can obscure oncoming traffic, making it difficult for a driver to ensure that the path is clear before overtaking. Thus, it is crucial to prohibit passing in such situations to maintain safety.

In contrast, passing on flat roads, straight open roads, and in residential areas may sometimes be permissible, depending on the traffic laws, road markings, and general conditions. Flat and straight roads typically provide clearer sightlines, which can make passing safer, while residential areas often have specific regulations regarding speed and passing due to the presence of pedestrians and parked vehicles.