What does a solid yellow line signify?

A solid yellow line on the road is an important visual cue for drivers, particularly motorcyclists, as it indicates that passing is not allowed. This is designed to enhance safety by preventing overtaking in areas where visibility might be limited or where other hazards are present, such as curves, intersections, or pedestrian crossings. By adhering to this rule, motorcyclists can reduce the risk of collisions that might occur due to sudden maneuvers. Proper understanding of road markings like solid yellow lines is crucial for safe riding practices and overall traffic safety.

The other options do not accurately define the meaning of a solid yellow line. For example, while traffic congestion, road construction, and speed limits all relate to traffic management, they do not specifically address the prohibition of passing, which is the primary function of a solid yellow line.