| http://www.w3.org/ns/prov#value | - An automatic warning signal system for a leading vehicle (e.g., an automobile, car, truck, tanker, van, bus, motor home, motorcycle, or other vehicles, etc., as well as trailers of all kinds in-tow, etc.) including a detector for detecting when a following vehicle comes within a target area too close to the rear of the leading vehicle, and a circuit for coupling a signal device and an energy sourc
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