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Changing headlights and tail lights are common tools of those who perform serious surveillance at night on a frequent basis.

Switching lights off and and on, dimming, and changing beam elevations in various combinations are quite useful techniques for following savvy subjects and losing tails on long hauls....

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Changing headlights and tail lights are common tools of those who perform serious surveillance at night on a frequent basis.

I honestly did not know that piece of information.

<<< slapping hand on forehead >>>