Delineators are vertical markers that guide vehicular traffic by creating a visible lane. A typical application is to separate traffic from crossing over from one lane to another, or to separate vehicles from pedestrians.
Delineators are subject to heavy physical abuse from meandering vehicles. Most modern delineators are made from flexible high-visibility plastic, so that they yield but bounce back up if attacked. The forces on the base of the delineators are quite high, and most often epoxy glues are not strong enough to keep the delineators firmly attached for any length of time.