Found this on another forum. I found the following excerpt in a report compiled by the Wisconsin DOT in 2005 it may be outdated by now, but it is all I could find. Hope this helps you out. Anyway, here is a link to the full report: http://on.dot.wi.gov/wisdotresearch/...tsratvlaws.pdf Summary StateLawsand Regulations Eight states—Arizona, Idaho, Indiana, Kansas, Minnesota, Montana, North Dakota and South Dakota—allow the public to operate at least some classes of ATVson someroadwayswith varying levels of restrictions (for example,states may require a certain engine size, vehicle length or weight, and presence of headlights or taillights; and may require that the operator wear a helmet). Five additional states(Alaska,Missouri, Nevada, Oklahoma and West Virginia) allow more limited travel, such as when a highway is impassable by automobiles due to snow, or on single-lane roadways. Virtually every stateallowslocal municipalitiesto authorize use of ATVs on local rights-of-way, which may include pavements, shoulders, ditches, and slopes of highways and ditches. Of the eight states that allow the most ATV travel on roadways: • Two states(Minnesota and North Dakota) require that ATV operators be a minimum of 16 years old, or in certain circumstances 12 years old; Minnesota also allows 10-year-olds in certain areas. A third, Indiana, requires operators on public lands to be 14, unless supervised. The other five states have no minimum age requirement. • Two statesrequire operators of a certain age to earn certification in a safety course; Minnesota requires it for ages 12 to 15, and North Dakota for ages 15 and under. Arizona recommends it for all riders, and offers classes for ages 5 and up. • Four states require ATVsto betitledwith a transportation or motor vehicles agency. Four require registration with motor vehicles agencies, and one with the state parks and recreation department. Across the United States, only a few states restrict the use of ATVs to certain hours of the day, possibly because headlights and taillights have become standard equipment on ATVs. States that require certain equipment on ATVs for use on highways or rights-of-way, or when crossing roadways, include lighting in the requirements. We did not identify any states that restrict use to certain months of the year