What do yellow lines on the road separate?

Yellow lines on the road are used to delineate lanes of traffic traveling in opposite directions. This design is crucial for maintaining safety on roadways; it provides a clear visual cue to drivers about the separation of opposing traffic flows. When a driver encounters a solid or broken yellow line, it indicates that they should expect vehicles traveling from the opposite direction, and they must exercise caution.

The presence of yellow lines helps prevent accidents by clearly marking where passing is allowed (using broken lines) or prohibited (using solid lines). This helps in planning safe maneuvers, such as overtaking and turning, while ensuring that both directions of traffic are properly organized.