Like someone here already said, such violations are the jurisdiction of the
FAA. The locals could post most anything on the gas pumps, but it'll never
fly (pardon the pun) in court.

If you sign an agreement, you are bound by the terms. You may legally
agree not to fly fast and low, and although you may not be subject to
local criminal sanctions, you would be subject to whatever penalties you
agreed to abide by, same as any other contract.

Jose
--
The price of freedom is... well... freedom.
for Email, make the obvious change in the address.