Patent ID: 6847306
Filing Date: 2005-01-25
Classification: G08G,Y10S

Abstract:
1. An emergency traffic signal attachment for use on one lamp of a traffic signal, said attachment comprising: a housing mountable on the traffic signal over said one lamp thereof and having an opening to pass the light through the housing; an electro-optically responsive panel in said opening for overlying said one lamp and normally being transparent to pass light through the opening, said panel having a reflective outer surface and being operable when energized to become opaque; a source of red light on said housing on the side of the panel opposite said one lamp and operable when energized to produce red light to be reflected by the panel as a substitute for the light of normal operation; and a controller responsive to preemptive signals from approaching emergency vehicles on an intersecting street and operable to energize said panel to become opaque and to energize said red light source, thereby to override the normal operation of the traffic signal.