A signal mirror system for a vehicle includes a reflective mirror element comprising a semitransparent nondichroic mirror reflector coated onto a light-transmitting substrate. The visible light transmission through the reflective mirror element is in the range of from about 1% visible light transmission...http://www.google.es/patents/US7572017?utm_source=gb-gplus-sharePatente US7572017 - Signal mirror system for a vehicle
