i do not know. certainly, you would need safety equipment like headlights, signal lights, brake lights..
but if motorcycles and scooters need to be properly registered if it were to run on public roads, i suppose your atv, which can be interpreted as two motorcycles welded side by side, should also be... provided they have the requisite headlights, tail lights, signal lights..
sabihin mo na lang pag sinita ka, "kuliglig po ito, napintahan lang ng super kinis.."
heh heh.