Hump Bridge Ahead Sign Post Mounted - Dia 528 R2/RA2 (Face Only)The hump bridge sign means there is an incoming hump bridge that is so severe that without warning, a driver may lose control. If the hump bridge hides a hazard, another sign indicating this should be mounted to the same post with the first encountered hazard at the top. If there is a risk of long vehicles grounding on the bridge, warning sign 782 "Risk of Grounding" should be mounted below. This sign may also be used with: Diagram 511 "Reduce Speed