“Refusing to answer is refusing to cooperate.”
That is the current interpretation of the law. But if that logic is extended:
Small domestic violence case across the street. Cops knock on your door to find out if you saw or heard anything. They see you looking at them through the window but you refuse to answer the door (because you know why they are there and you are friends with both parties).
Do the cops then decide you are interfering, kick down your door and arrest you?
Your domain is protected from unlawful entry unless they suspect a crime in progress.
Your car is operating on a government road.