Apparatus and method for defining {HEAD ~ a safety zone} using {TAIL ~ a radiation source} for a vehicle 
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Apparatus and method for defining { HEAD ~ a safety zone } using { TAIL ~ a radiation source } for a vehicle
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH