In the New Jersey motor vehicle code the definition of Highway basically means any public roadway. It’s not what do you think a highway is.
‘“Highway” means the entire width between the boundary lines of every way publicly maintained when any part thereof is open to the use of the public for purposes of vehicular travel.’
I understand that, but I could see an argument that a horse does not use its own power unless first started by human power. Of course, the same could be said for a car, so its not the best argument, but lawyers get paid to at least think of this kind of craziness.
A co-worker was cited for doing 42 in a 30-mph zone… on his bicycle. He surmised the radar had reflected off someone going the other way in an auto. He fought it by going to court and saying, “Your honor, if I could pedal a bike at 42-mph, I’d be in the Olympics!” Case dismissed.