The present invention pertains to {HEAD ~ an apparatus} and method for defining a safety zone for {TAIL ~ a vehicle} 
The present invention pertains to { HEAD ~ an apparatus } and method for defining a safety zone for { TAIL ~ a vehicle }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL