What does a solid yellow line indicate?

A solid yellow line serves as a clear indication that it is a no-passing zone. This means that drivers are not allowed to cross over the line to pass another vehicle in the same direction. The purpose of this marking is to enhance safety, especially in areas where visibility is limited or where passing could be dangerous due to curves, hills, or other obstacles that may impede a driver's ability to see oncoming traffic.

By maintaining a solid yellow line, traffic regulations help to ensure smoother and safer travel for all drivers. In scenarios where a solid yellow line is present, it’s critical for drivers to stay within their lane and avoid crossing the line, as doing so could result in head-on collisions or other types of accidents.