Earlier quoted context omitted.
I voted that a police car/ambulance driving into the park _was_ breaking the rules, though breaking the rules may be justifiable in some circumstances. The smoke signal example you gave is similar - if I’m lost, I care more about being found than the punishment for starting a fire. If the ‘no campfires’ rule was punishable by death (and enforced), perhaps I wouldn’t risk a smoke signal
In the US, usually the law is structured in such a way that the powers of the police are at the state level. A city or park authority isn’t empowered to restrict their actions in pursuit of her duty. At the end of the day, as a person living their life, it really isn’t your business to know whether an airplane is intruding on park airspace. You should not drive in the park as a private citizen. If you’re a ambulance…
Re: The rule says, “No vehicles in the park”
#1001"State Police" (or "State Troopers", or "{$state} Highway Patrol, are different from "County Sherif[s | [Deputies]" and city/town/village police. Each level has a local jurisdiction. A city police officer (a subset of city authorities) tends to have authority to restrict actions according to law. Also, a city or park official may technic'ly have the right to do so according to law & park regulations…although some non-pliable people may force the official to summon police.