What does a solid white line indicate?

A solid white line is a marking on the roadway that signifies lane usage rules. Specifically, it indicates that lane changes are discouraged but not prohibited. This means that while it may be safer or advisable to stay in your lane, drivers are still permitted to switch lanes if necessary, such as for avoiding an obstruction or if the situation requires it. This differs from a dashed line, where lane changes are encouraged, and a solid double line, where no lane changes are allowed. Understanding this marking is crucial for safe driving practices and adherence to traffic regulations.