What does a solid yellow line on the road indicate?

A solid yellow line on the road indicates that it is a no passing zone. This means that vehicles are not allowed to cross the line to overtake or pass another vehicle. The presence of a solid yellow line is meant to enhance safety by indicating areas where visibility may be limited or where passing could be particularly dangerous, such as on curves or hills. In such areas, the risk of collision increases, and the solid yellow line serves as a clear guideline for drivers to remain within their lane. By prohibiting passing in these zones, traffic flow is improved, and the likelihood of accidents is reduced, contributing to overall road safety.