The reverse curve (double curve) sign warns drivers of upcoming warn motorists of two successive turns or curves that follow each other in opposite directions. This sign is made of .080" aluminum that will not rust. It includes 2 pre-punched 3/8" mounting holes, radius corners and meets MUTCD specifications for highway Use. The signs are designated for years of outdoor use. Choose from left and right reverse curve designations and they are available in engineer grade and high intensity pristmatic reflective sheeting.