calculating an illumination directed toward the eye point of {HEAD ~ the driver} of the target vehicle from {TAIL ~ the headlight} of the reference vehicle 
calculating an illumination directed toward the eye point of { HEAD ~ the driver } of the target vehicle from { TAIL ~ the headlight } of the reference vehicle
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH