What does a solid yellow line indicate?

A solid yellow line serves as a clear visual signal regarding the regulations on passing. Specifically, it indicates that passing is not allowed for drivers in both directions. This helps to maintain safety on the road, particularly in areas where passing could lead to dangerous situations, such as curves or areas with limited visibility. The presence of the solid yellow line signifies to drivers that they must remain in their lane without attempting to overtake other vehicles.

The other options do not align with the meaning of a solid yellow line. Passing is explicitly prohibited, which is a crucial rule that helps prevent accidents and ensures smoother traffic flow. Understanding this distinction is important for safe driving practices.