I'll try one last time, but you seem bent on stretching everything to come to a my fault decision

A sign posted authorized vehicles only in the middle of a public road where there are house's mailboxes, other cars, and more streets does not indicate no parking anywhere. Especially given a realtor sign and an open house sign up the road.How do deliveries get made? The mail?
How can a state park blockade other peoples private property when the only way to it is through that road.
The sign did not say beyond this point, it did not say no parking, to think such with all that is outlined here is illogical. I'm not looking for validation for something I know isnt reasonable, or even explained. It is not here.
It does not make the case for a parking ticket, it was unjustified.
What I'm asking is what the law says about the need for there to be a no parking sign, and how can this dictated by a state park for other peoples property as well since the park does not own all the property behind that sign.

Since I seem to have a comprehension problem, perhaps you could explain to me what exactly authorized vehicle means? And what does that have to do with parking on someone elses property? Or parking at all for that matter.