While Illinois does not require ATV insurance for off-roading, if you use it on any highways or roads of any sort in the state you are required to have minimum protection on that vehicle.
Because ATVs are not recognized or categorized as being meant for regular roadways and are therefore not street legal", they are actually considered "off-highway vehicles" within the definition of that phrase in the Illinois Vehicle Code.
Get a permit from the Illinois Department of Natural Resources (IDNR), make sure your ATV complies with all safety rules, get insurance, clearly display your registration and insurance information, and obey all traffic laws and regulations to make your ATV street legal in Illinois.
On the outside of your car, street legal requirements include ground clearance, emission control systems, tires, brakes, bumpers, license plate, lights, hood, and windshields.
What You'll Need to Register your Vehicle in Illinois Completed Application for Vehicle Transaction (Form VSD 190) (available through the Electronic Registration and Title system or at SOS office; only valid for 7 days following online completion) Proof of Illinois residency. Proof of ownership.
All vehicles operated on Illinois public roads must be titled and registered.
Items that must be titled or registered with an Illinois agency include, without limitation, motor vehicles (e.g., cars, trucks, vans, buses, etc.), motorcycles, watercraft, aircraft (e.g., airplanes, helicopters, hot-air balloons, gliders, etc.), trailers, motor homes, manufactured (mobile) homes, snowmobiles, and all ...