What does a solid white line indicate?

A solid white line serves as a lane boundary and indicates that lane changes are not permitted. It provides a visual cue to drivers that they should stay within their designated lane and emphasizes the importance of maintaining safety and order on the roadway. This rule is particularly important in situations such as heavy traffic or when the lane is adjacent to a pedestrian walkway or a bicycle lane where safety concerns are heightened. The presence of a solid white line is an indication that the conditions do not warrant moves into adjacent lanes, helping to prevent accidents and ensure smoother traffic flow. Understanding this helps drivers make safer decisions while navigating roadways.