What does a solid white line on the road signify?

Answer: B — Do not change lanes or pass

A solid white line on the road indicates that drivers should not change lanes or pass. This marking is used to signal that lane changes could be dangerous or are prohibited in that area. It typically appears in situations where lane discipline is critical for safety, such as near intersections, pedestrian crossings, or in areas where vehicles may be merging into or from a lane. The solid line serves as a visual cue to maintain the lane and promote orderly traffic flow. It's essential for drivers to adhere to this rule to prevent accidents and ensure the safety of all road users. Understanding this traffic marking can help maintain safety on the roads by discouraging unnecessary lane changes that could lead to collisions.