Double yellow line refers to the road marking consisting of two solid yellow lines painted in the center of the road to indicate a no-passing zone. This marking is commonly used in many countries to regulate traffic flow and reduce accidents. However, there are different terms used to describe this road marking in different parts of the world. For example, in the UK, it is known as a "double white line," while in Australia and New Zealand, it is referred to as a "double continuous line." Double yellow lines serve as a clear visual cue for drivers to avoid passing, especially in areas where visibility is limited.