The registration numbers would help a little, maybe. Keep in mind, those rules varied by state on size & placement, so not a cure all. Bottom line, responsible riders are generally not the problem, we are always going to have a few rogue riders out there no matter what, whether on an ATV, SxS, Boat, Jet Ski, Motorcycle. If you see it happening, as Mrs. RB said, stop them & correct them. We have to police ourselves.-Mezz
Michigan could require them as a condition to be on the trails, or make the trail permit number 3" tall. Self-policing is great, but these days who's going to approach a group of riders and tell them to stop what they are doing? Seems like you are asking for trouble by doing so. Better to snap a picture, hopefully get the registration number and turn them in.