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