Two men have been arrested by Danbury Police illegally riding motorcycles or ATVs and City officials are calling for a crackdown.  Mayor Joe Cavo told the Newstimes that he plans to reappoint an old committee that had looked at creating an ordinance with tougher penalties for those who drive ATVs, mini bikes and similar unregistered vehicles on City streets.  He called it a health, safety and welfare issue for the public.  Cavo headed the former ad hoc committee, but wasn't able to get ordinances from other municipalities.  Police say in the incidents over the weekend, an 18 year old and a 24-year old were observed riding wheelies and charged with reckless driving, riding without a motorcycle endorsement, and operating an unregistered motor vehicle. The 24-year-old was also charged with driving with a suspended license.  ATVs are prohibited from being ridden on the street except to cross public roads.