What does a solid yellow line indicate?

A solid yellow line serves as a clear visual signal to drivers regarding the rules of the road. Specifically, it indicates a no passing zone, meaning that overtaking other vehicles in that area is prohibited. This is typically found on roads where visibility is limited or where it is considered unsafe to pass, such as on hills or curves.

The purpose of this marking is to enhance safety by preventing drivers from attempting to pass when it is not safe to do so, thereby reducing the likelihood of head-on collisions and other accidents. Understanding this rule is essential for safe driving practices.

The other options suggest scenarios that are not applicable to solid yellow lines. No parking zones, passing allowed, and lane changes permitted are represented by different kinds of road markings and signs, which inform drivers of distinct circumstances or regulations for those actions.