What does a solid white line indicate?

A solid white line indicates that lane changing is discouraged and may be hazardous. This type of line is used to separate lanes of traffic moving in the same direction. It serves as a warning to drivers that there are specific conditions or factors that make it unsafe to switch lanes, such as limited visibility or heavy traffic. The presence of a solid white line conveys to drivers that they should remain in their current lane to ensure safety. This understanding is crucial for maintaining smooth traffic flow and minimizing the risk of collisions. The other choices do not accurately convey the meaning or purpose of the solid white line in traffic regulations.