What does a solid yellow line indicate?

A solid yellow line indicates that it is a no passing zone. This means that drivers should not cross the solid yellow line to overtake another vehicle. The purpose of this marking is to enhance safety on the road, especially in areas where visibility may be limited or where it's particularly dangerous to attempt a pass, such as curves or hills. It serves as a clear visual cue to drivers that they need to stay in their lane and not engage in passing maneuvers when a solid yellow line is present.

In contrast, the other options present misunderstandings of roadway markings. For instance, a passing zone would typically be indicated by a dashed yellow line, while a solid yellow line specifically prohibits passing. Two-way traffic is usually indicated by a double yellow line configuration, which differs from a single solid yellow line. Parking regulations are governed by different markings that often involve curb colors and signs, rather than a solid yellow line. Understanding these distinctions is crucial for safe driving practices.