What do white lines on the road indicate?

White lines on the road are primarily used to indicate lanes for traffic moving in the same direction. When you see a solid or broken white line, it signifies that vehicles can travel in that lane, and they designate the separation between lanes moving in parallel. This is crucial for maintaining order and safety on the road, ensuring that all vehicles are aware of their position relative to others traveling alongside them.

While other options may refer to different road markings or conditions—for instance, markings indicating pedestrian crossings or warnings about hazards—they do not pertain to the function of white lines specifically. The clarity of white lines helps in guiding drivers and preventing confusion, especially on busy roads with multiple lanes.