What does a solid yellow line indicate on the road?

Answer: B — Passing is not allowed

A solid yellow line on the road indicates that passing is not allowed. This signifies to drivers that they should remain in their lane and not attempt to overtake another vehicle. The purpose of the solid yellow line is to enhance safety by preventing potentially dangerous maneuvers, especially in areas where visibility is limited or where there may be oncoming traffic. In contrast, a solid yellow line does not imply that there are different lanes for vehicles to freely navigate or that passing is permissible under any conditions. This is essential for maintaining orderly traffic flow and minimizing the risk of collisions. Recognizing traffic markings, like a solid yellow line, is crucial for safe driving practices.