Steep Hill Downwards Ahead Road Post Mounted Sign - 523.1 R2/RA2 (Face Only)This permanent warning sign indicates that there is a steep downwards gradient ahead. The percentage marked on the sign can be varied to reflect the road conditions. Our example shows a 10% downward gradient this means that for every metre travelled forward 0. 1 of a metre will be lost in elevation. This sign is often used in combination with supplementary plates 525, 526 and 527 all of which warn drivers to use a low gear to regulate speed so as to