What does a solid white line on the road signify?

Answer: B — Lane changing is prohibited

A solid white line on the road indicates that lane changing is prohibited. This means that drivers should remain in their current lane and avoid crossing the line to change lanes. The presence of a solid white line is a method of promoting safety by discouraging maneuvers that could lead to accidents, particularly in areas where merging or lane changes might be hazardous. In contrast to broken white lines, which allow for lane changing when it's safe to do so, a solid white line serves as a clear boundary that drivers should not cross. Understanding this helps maintain the flow of traffic and ensures that all road users can navigate safely. This knowledge is crucial for new drivers, as adhering to these traffic markings is a vital part of safe driving practices.