What does a solid white line indicate?

A solid white line indicates that no lane changes are permitted. This line serves as a clear guideline for drivers, emphasizing that they should remain in their designated lane and not cross over into adjacent lanes. The presence of a solid white line is intended to enhance safety by preventing unexpected lane changes, which can lead to accidents, especially in areas of high traffic or when approaching intersections. This restriction helps maintain a predictable flow of traffic, ensuring that all vehicles operate within their designated lanes without the risk of merging into another lane where vehicles may be approaching.