What does a solid yellow line on a roadway indicate?

A solid yellow line on a roadway indicates that no passing is allowed. This is a critical safety measure designed to prevent overtaking another vehicle in situations where visibility is limited or where the road conditions do not permit safe passing. The presence of a solid yellow line typically signifies that the road curves, has intersections, or presents other hazards that could make passing dangerous.

Drivers are advised to remain in their lane and should not cross the line unless they are making a left turn. Understanding this signaling helps in maintaining the flow of traffic and reducing the risk of accidents, particularly in areas where increased caution is required. This marking effectively communicates to all drivers that maintaining their lane is essential for safety on that part of the road.