What does a solid yellow line on the road indicate?

Answer: B — No passing allowed

A solid yellow line on the road indicates that no passing is allowed. This marking is used to signal drivers that it is unsafe to overtake another vehicle in that area. The presence of a solid yellow line generally indicates that visibility or other conditions make passing potentially dangerous. Drivers are expected to respect this marking to ensure safe travel. The line serves as a guide for maintaining safe distances and adhering to regulations designed to prevent collisions, especially on roadways where conditions may limit visibility, such as curves, hills, or intersections. Understanding this marking is crucial for promoting safety on the roads, as it provides a visual warning that should not be ignored.