What does a solid white line on the roadway indicate?

A solid white line on the roadway indicates that drivers should not change lanes. This marking is used to signify that lane changes are discouraged or prohibited, helping to maintain the flow of traffic and ensure safety, especially in areas where merging could create hazards. The presence of the solid white line often signifies that the lane is designated for a specific purpose, or it may indicate areas where visibility is limited, making lane changes dangerous. Therefore, adhering to this rule is crucial for safe driving practices. The other options suggest actions that could lead to unsafe driving situations in areas with solid white lines.