What might indicate a road marking has a solid line?

A solid line on the road is a clear visual cue that indicates restrictions on lane changes. Specifically, it signifies that drivers are not permitted to cross that line to change lanes. This is usually implemented for safety reasons, such as in areas where it is hazardous to switch lanes due to nearby obstacles, pedestrians, or when merging lanes is dangerous.

This marking plays a vital role in the flow of traffic, ensuring that vehicles remain in their designated lanes and reducing the risk of accidents. It provides clear guidance to drivers, indicating that they should maintain their position within the lane and not attempt to overtake or switch lanes when doing so could pose a danger to themselves or others.

In contrast, other markings, like broken lines, offer more flexibility and indicate that lane changes are acceptable under certain conditions, contributing to smoother traffic movement.