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