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No vehicles in the park is a rule for the people that use the park. The emergency vehicles aren't 'using' the park so it doesn't apply to them.

> No vehicles in the park is a rule for the people that use the park

Says who? So I can park my car in the park and take the train so long as I don’t “use” the park? Or drive through it on my way to work?

But then you'd be "using" the park (for parking), which means you fall under the definition of "use"!