What must a driver do when they see a broken white line?

When a driver sees a broken white line, it indicates that lane changing is allowed. The presence of a broken line signifies that the lanes are not physically separated, and drivers have the option to change lanes if it is safe to do so. This means the driver should ensure that the maneuver can be executed without endangering themselves or others on the road.

In this context, safety is paramount. Drivers should check their mirrors, signal their intention, and ensure that the adjacent lane is clear of other vehicles before making the lane change. This feature of the broken line is specifically designed to facilitate smooth traffic flow, encouraging lawful lane changes while maintaining safety standards.

While other choices might imply actions that could be necessary under different circumstances, they do not align with the guidelines related to broken white lines, which specifically permit lane changes when it is safe to do so.