I'm also somewhat surprised how people flatly refuse to handle being asked to apply rules as written, which the game does. (Otherwise I would assume they just haven't read the introduction closely.)
To my mind, the park just needs an additional rule that allows for 911 emergencies, but this does not make these vehicles not vehicles. I am ready to disregard rules in a bunch of cases in real life, but I would not call this following the rules. Sometimes you just disregard rules and authority because you value quality of human life more. "Rescuing" these cases after the fact as following the rules actually smells faintly authoritarian to me (so that you get rid of legitimate rebellion), though maybe it's an oversensitive take.
Also surprised that I ended up agreeing with 93% of people apparently. This is despite applying a probably idiosyncratic definition of vehicle: separate from the functioning of human being, with a mechanism of propulsion and capable of transporting things or persons. I ended up allowing almost everything. I would disallow bikes but not kick scooters. Maybe I got owned by the "bikes are vehicles" propaganda.
And for moderation, any judicial role is a form of political power. This is why making it limited and not completely concentrated is more important than trying to come with perfect rules. In practice, this means you can voice your discontent and realistically go somewhere else.