Adverse camber' Supplementary Plate - Post Mount Diagram 513.1 R2/RA2The Adverse Camber supplementary sign is most commonly used alongside signs 512 and 513. It indicates to drivers that the camber of the road may have a negative impact on the handling of their vehicle, or load stability. Like most of our supplementary plates, this sign can be purchased with different X heights suited to the road it is being used on. The X height indicates the height of the text on the sign, and has an impact on the overall size of the