PW-66 2 Bar Chevron Boards, also known as PW66, WYS3 or a W20-1 sign, are used to advise the direction & speed around a corner and provide delineation on horizontal curves. Can be used in conjunction with the PW-67 1 Bar Curve Indicators. Consists of a 2 bar chevron design wtih a speed indicator, displayed on a standard permanent warning PW chevron sign. Please specify required speed and direction (left or right) at time of order.