"Delineator" Natural Recordings by Native Speakers
A delineator is a small cone-shaped marker placed at the edge of a road, typically made of metal or plastic, which serves to separate lanes of traffic or mark the center of the road. It is used to define the division of traffic flow, particularly on highways, freeways, and other high-speed roadways.
To delineates something means to outline or define its boundaries, limits, or scope clearly, often in a precise or distinct manner.