What does a solid white line on the roadway indicate?

A solid white line on the roadway signals that crossing the line is discouraged. This is particularly important in situations where traffic may be merging or where there is a need to maintain a safe distance between lanes of travel. The purpose of the solid white line is to promote safety by indicating that drivers should remain in their lane and not attempt to pass vehicles. This helps in reducing the likelihood of accidents and ensures a smooth flow of traffic. In contrast, dashed lines or other markings may indicate different rules, such as allowing lane changes or designating special use areas, but a solid white line clearly emphasizes the importance of not crossing it.