For the oregon riding rules having an atv that is only made for one person you can only have 1 person on it. even if they are very young and even with a helmet they can't do it at all with out a big fine. If it was an atv built for 2 people that is excluded from the rule but the kid would have to be behind you while you ride. YOu can only legaly have 1 person on an atv built for 1 person. 2 if the atv is a 2 up machine you can have 2 people on it. but with next years rules you cant have a side by side on any atv trails any more like we use to. they will have there own trails and will be able to share the orv trails. Sucks since i dont have enough suspension travel to navigate the orv triails near me.