I'm tellin' ya, just USE the PUBLIC fields until thrown off, and then make THEM show you in a WRITTEN manner why your activity is NOT allowed on PUBLIC property.
Use the law AGAINST them.

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !