A visible light source adapted to be mounted on the vehicle for generating visible light to be used to create warning signals which are viewed by observers remote from the vehicle. A dichroic element adapted to be mounted on the vehicle and adjacent to the visible light source transmits at least some of the visible light generated by the light source and reflects at least some of the visible light generated by the light source. The transmitted and reflected light provides warning light signals within different wavelength ranges when viewed by an observer remote from the vehicle.