Check your states road laws. In most states, cars aren't suppose to block driveways either. It's one of those laws that don't get enforced. If you are on a two lane street coming to a stop with a driveway on your right, you are suppose to stop before the driveway to allow for left hand turns. Not doing so impedes traffic in the opposite direction if someone is turning left and you have the driveway blocked. As I said, it is never enforced unless you are in a small town where they cite you for everything under the sun since it's their way of collecting revenue. The fact that cars do it now, doesn't make it legal, it just means that no one is enforcing that statue.