Ever have one of those traffic stops where you wish your cover was right there, right now?
You can create the perception of another person simply by using the word “we” during your conversation with the violator.
“WE saw that you rolled the stop sign...” “WE stopped you because...” A glance rearward over his roof and a quick nod would add the physical affirmation that there is another person somewhere outside of the violators vehicle.
It feels kind of strange at first, knowing that you are the only cop there, but the violator does not know that. Now you’ve created the perception, if only in his mind, that there are two of you.