W1 2a Curve with MPH Sign Size:36x36 3M™ DG3 Reflective Sheeting Series 3M™ DG3 Reflective Sheeting Series 4000 is the most efficient retroreflective prism design currently available from 3M and is designed to be used on vertical traffic signs and delineators W2 3 Side Road (Angled) signs are essential for alerting motorists to an upcoming intersection where a side road joins the main highway at an acute angle W1 2a Combination Curve Advisory Speed signs are essential for alerting motorists to a gradual change in roadway alignment while providing a recommended safe speed for the turn This clear and concise sign provides immediate awareness in advance of curved sections on highways and rural roads