From what I read, the requirement for DOT approved tires is a Federal regulation. I have found nothing in the Arizona statutes relating to that. Does the rule apply only to Interstate highways? The top speed of my UTV is 30 mph. To get to forest roads I have to use a state highway which usually has very little traffic. The front tires are getting worn and I don't want to spend big bucks to replace them with tires rated for 70 mph if it isn't necessary. I haven't seen the local law enforcement give anyone any hassle, but...