Originally Posted by Digital_Cowboy

What I do, is if I can catch up with them without actually chasing them. Is to pull up alongside of them and say:

"Just a little friendly advice" or "Do you mind a little friendly advice?" And then tell them how they need to have lights on their bike, and that the LEOs can ticket them for not having lights on their bikes.

I find that that tends to work the best. As it hopefully comes off as not being confrontational. Or at the very least hopefully not too confrontational.