{HEAD ~ The boundary distance} is defined as {TAIL ~ a maximum distance} between the reference vehicle and a target person such that, when a distance between the reference vehicle and the target person is within the maximum distance, the target person is estimated to be undazzled by the headlight of the reference vehicle 
is defined as
{ HEAD ~ The boundary distance } is defined as { TAIL ~ a maximum distance } between the reference vehicle and a target person such that , when a distance between the reference vehicle and the target person is within the maximum distance , the target person is estimated to be undazzled by the headlight of the reference vehicle
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH