What does a solid yellow line indicate?

A solid yellow line indicates that no passing is permitted in that area. This traffic marking serves as a warning to drivers that it is unsafe to overtake another vehicle in that lane due to potential hazards, such as curves, intersections, or other conditions that could make passing difficult or dangerous. The presence of a solid yellow line emphasizes the importance of staying in your lane and maintaining a safe following distance from the vehicle ahead.

The other options do not align with the meaning of a solid yellow line. For instance, a dashed yellow line is typically used to indicate that passing is allowed when it is safe to do so. Lane reversal during rush hour and indications that it is safe to change lanes would not be communicated by a solid yellow line, as they serve different purposes related to traffic flow and safety.