Delineators are designed to "delineate" traffic or guide traffic into a specific lane. Delineators are available in many heights and color choices. They are also come in both tubular and flat panel designs. All delineators are designed to withstand vehicular impacts. The number of impacts range from 340 hits at 35 mph to 75 hits at 55 mph. , depending on the category of delineator. All categories of delineators come with reflective sheeting. The reflective sheeting may be installed on one side or both sides.