There are places all throughout New England where a person can responsibly operate OHVs. Also, several OHVs (like dirt bikes) are capable of being operated on the road with some modifications and possession of a motorcycle license and following the rules of the road.

It's the same as skateboards. You can ride a skateboard most places, but no if you want to do stunts and shit, you should do it in an environment that won't cause other people injury or property damage, like a skatepark.