In preferred embodiments of the invention, when {HEAD ~ the headlight} is fitted on {TAIL ~ a vehicle}, the said first and second straight line motions are effected along a horizontal axis and a vertical axis respectively 
is fitted on
In preferred embodiments of the invention , when { HEAD ~ the headlight } is fitted on { TAIL ~ a vehicle } , the said first and second straight line motions are effected along a horizontal axis and a vertical axis respectively
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL 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