Muth Mirror Systems introduces a Driver Warning Signal Mirror for dump, concrete and other heavy trucks with liftable hoppers or beds. This mirror features a signal that alerts the driver the hopper or bed is still in the raised position. The signal appears in the lower portion of the glass of the mirror and consists of red LED's in the shape of a chevron that point up and flash until the hopper or bed is lowered. Professional installation of the Driver Warning Signal Mirror is recommended.