What does a solid white line on the road mean?

A solid white line on the road serves to indicate that the lanes it separates are intended for traffic moving in the same direction. This line is primarily used to guide drivers, helping to maintain safe lane discipline. If a driver encounters a solid white line, this usually signals that lane changes are discouraged or not allowed, emphasizing the importance of remaining within one’s lane for safety reasons. This is particularly significant in areas where lane shifts could lead to dangerous situations, such as near intersections or in situations where there is heavy traffic.

The other options present scenarios that are not accurately represented by a solid white line. For instance, lanes moving in opposite directions would typically be separated by a broken yellow line, and bus stops are generally indicated by specific signage rather than line markings. Additionally, passing is usually indicated by broken lines, which allow changing lanes when safe to do so.