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