The method 1 wherein said collecting a vehicle factor further includes collecting {HEAD ~ the vehicle speed} of {TAIL ~ the vehicle} 
The method 1 wherein said collecting a vehicle factor further includes collecting { HEAD ~ the vehicle speed } of { TAIL ~ the vehicle }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL