In my neck of the woods we have to contend with ATV's sharing most roads that are not numbered or lettered. They do not have any safety equipment (turn signals, horns, mirrors) and only require a safety course for underage operation. They do not follow helmet laws, even for underage operators. They are supposed to stay as far off the roadway as possible, but you have to be aware that they can turn without warning.
I don't mind ATV's for trail riding, since the road crossings are marked but some people use them as a substitute for their car when they lose their license.