What do double yellow lines indicate?

Double yellow lines indicate that no passing is allowed in either direction. This marking is used on the roadway to signify that it is unsafe to overtake another vehicle due to various factors, such as visibility or road conditions. The presence of these lines serves to enhance safety by preventing drivers from attempting to pass when it could be dangerous, such as on curves or hills where visibility is limited.

The situation and layout of double yellow lines communicate a clear message to drivers: to stay in their lane and not attempt to pass vehicles in front of them. This regulation helps to reduce the risk of head-on collisions and ensures smoother traffic flow in areas where overtaking might lead to dangerous situations.