Abstract: A digital light projection system is provided that includes a light pipe for generating and outputting a light beam. An input mirror is provided that is configured to receive a light beam from the light pipe and deflect it onto a digital mirror device (DMD). The DMD is configured to deflect the light beam onto an imaging mirror that is configured to image the light beam onto a flat mirror.

Abstract: A retro-reflector system 20 suitable for a highway lane marker is moulded in one piece from a transparent plastic material and has a plurality of side by side curved "roof edge" reflectors 21 (only one of which is illustrated) and a part elliptical lens 26 extending across the front "V" of each of the "roof edge" reflectors 21. A light ray on path 23 will pass through lens 26, be reflected by surfaces 22, 24, and will leave the lens 26 along a path 28 which is inclined slightly upwardly with respect to path 23 so that light from a vehicle's headlights will be directed upwardly towards the driver's head.