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