the cops at roadblocks always look for exhaust, and see if you change anything in the engine compartment, .. i dun know the exact regulation
adaptive can turn left right, up and down, and 'cornering lights' (
i still have no idea what these are) i just noticed, when u go up and down parking lots, your headlights can get into ppls' eyes or into the ground.. but key is how well it works in practice