ChadGadya, I’m sorry to have to break it to you but you’ve been misinformed. Dina d’malchusa dina applies to all laws that don’t force one to transgress halacha. It isn’t just a matter of cheating on your income tax.
And what happened to plain old menshtlichkeit? If someone is obviously using something as a driveway, why deliberately block it (even if the person isn’t Jewish)? That’s not how we make friends and influence people (while incidentally avoiding Cillul HaShem).