What do solid yellow lines indicate on the road?

Solid yellow lines on the road indicate that traffic is moving in opposite directions. These lines serve as a visual guide to inform drivers that they should not cross the line to pass vehicles, as it is unsafe to do so. The solid yellow line provides a clear separation between opposing traffic, emphasizing the need for cautious driving and adherence to road safety rules.

In the context of roadway markings, solid yellow lines are crucial for maintaining safe driving conditions, especially on undivided roads where vehicles can come head-to-head. This understanding is fundamental for drivers making decisions about lane usage and awareness of oncoming traffic.