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