Yeah it's a tongue-in-cheek PSA, but I feel like this needed to be said.

This Indiana State Trooper in the video reminds drivers of a very vital safety feature in our vehicles called, stay with me now, it could get very complicated, a "turn signal".

Now, pay close attention because this PSA shows you the operation of the turn signal. What a revelation! I mean, I'm not a 'gear head' but I think I got this.