US Patent 7905611 Vehicle having underside reflector

A vehicle for travel on a roadway comprising a vehicle and at least one retroreflector affixed to the vehicle, at least a portion of the retroreflector having a substantially planar, substantially transparent exterior surface, the substantially planar exterior surface aligned substantially parallel to the roadway. The retroreflector is preferably mounted to an underside of the vehicle to retroreflect light from oncoming vehicles when the vehicle has tipped on a side so that an underside portion of the vehicle may be seen by an observer in the oncoming vehicle.