What does a solid yellow line typically signify for drivers?

A solid yellow line primarily signifies that lane changing is prohibited. This marking is used to indicate that drivers should not cross the line to overtake another vehicle or switch lanes. The presence of a solid yellow line is aimed at maintaining safety on the road, particularly in areas where visibility might be limited or where passing could be dangerous, such as on curves or hills. This helps to prevent accidents by discouraging risky maneuvers.

While other markings and signs inform drivers about various regulations, such as the beginning of a no-passing zone or upcoming stops, a solid yellow line specifically communicates a clear restriction on lane changes for the protection of all road users.