What does a solid yellow line on the road indicate?

A solid yellow line on the road signals that no passing is allowed. This marking is used to indicate to drivers that overtaking other vehicles in both directions is prohibited, as doing so could be dangerous due to oncoming traffic or limited visibility. It serves as a clear warning that there are potential hazards ahead, making it crucial for drivers to remain in their lane and maintain a safe following distance. The presence of a solid yellow line enhances road safety by preventing risky maneuvers that could lead to accidents.