What does a solid yellow line mean?

Answer: C — No passing is allowed

A solid yellow line indicates that no passing is allowed for vehicles traveling in that direction. This marking is used to enhance safety by prohibiting drivers from crossing the line to pass another vehicle when it is unsafe to do so. It signifies that the lane is intended for the same direction of travel but warns drivers that visibility may be limited or that passing may be dangerous due to road conditions, curves, or other factors. When drivers see a solid yellow line, they should remain in their lane and refrain from attempting to overtake other vehicles. This rule applies regardless of the other traffic conditions. Understanding this road marking helps drivers make safer choices while navigating the road.