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 serves as a safety measure to inform drivers that they should not cross it in order to pass another vehicle. The purpose of the solid yellow line is to enhance safety in areas where visibility may be limited or where it may be hazardous to attempt to overtake another vehicle. This typically occurs on two-lane roads, especially in or near curves, intersections, or areas where there are frequent pedestrian crossings or other potential hazards. In contrast, a broken yellow line would indicate that passing is permitted when it is safe to do so, and other options implying crossing is allowed or merging zones do not accurately reflect the meaning of a solid yellow line. Understanding these markings is critical for maintaining safety on the roads and for complying with traffic regulations.