What does a solid yellow line indicate on the road?

A solid yellow line on the road indicates that passing is prohibited. This line serves as a clear visual cue to drivers that overtaking other vehicles in that lane is not allowed due to safety concerns. Solid yellow lines are commonly used on two-lane roads to alert drivers when they may encounter oncoming traffic, and crossing this line could create dangerous situations. The purpose of this traffic marking is to enhance safety and prevent head-on collisions, highlighting its importance in road regulations.