What does a solid yellow line on the road signify?

A solid yellow line on the road serves a crucial function in traffic regulation, particularly regarding passing maneuvers. When you encounter a solid yellow line, it signifies that passing is not allowed in either direction. This marking is used in places where visibility is limited or where it is deemed unsafe to overtake other vehicles, such as on curves or near intersections.

By indicating that passing is prohibited, it helps maintain safety on the roads by preventing potentially dangerous situations where vehicles might be attempting to pass without the necessary visibility or space to do so safely. This visual cue plays a vital role in guiding drivers’ behavior and ensuring that the rules of the road are adhered to for the sake of everyone's safety.