Are you in the driveway or part in? either way you are using it as a type of u-turn so you could get booked if seen, but again depending on the officers mood and traffic flow on that particular road I guess.. Also lines or no lines you could still get booked for that,because Its against the law to reverse out of a driveway but its just one of those things you can't police,If they did no one would leave their homes :o