What does a lane line indicate?

A lane line is primarily used to delineate the boundaries of traffic lanes on roadways, which is effectively represented by white lines that separate multiple lanes of traffic. These lines guide drivers in maintaining proper lane discipline, helping to prevent collisions and promote organized flow of traffic. Lane lines serve as essential visual cues for both drivers and riders, indicating where it's safe to drive and where to change lanes.

Understanding lane lines is crucial for safe driving, as they inform drivers about lane usage—such as whether it’s permissible to switch lanes or whether they are approaching a dedicated lane for turning. In contrast, the other choices do not accurately capture the function of lane lines; they either describe physical features or categorize vehicle types without addressing the purpose of lane lines in the context of traffic management.