What does a solid white line indicate on the roadway?

A solid white line on the roadway indicates separate lanes of traffic moving in the same direction. This line reinforces lane discipline, meaning that drivers should remain in their designated lane and avoid crossing the line unless necessary, such as to avoid an obstacle or during a legal maneuver.

This distinction is important for maintaining smooth traffic flow and ensuring safety, as it helps prevent confusion and collisions by clearly defining where one lane ends and another begins for drivers traveling in the same direction.

The other options suggest conditions or situations that do not apply to a solid white line. For instance, a solid white line does not indicate areas for passing, stopping, or separating opposing lanes; those require different markings, such as broken lines or specifically designated symbols.