politicophile

Most parking lots are private property. None are my private property. It stands to reason that I could be prosecuted for exceeding the state speed limit in someone else's parking lot even if the owner had not put up a speed limit sign.

Now, if you're talking about all the parking lots you own, that's a different story: you can consent to having autocrosses in your own parking lots, e.g.

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The peculiar evil of silencing the expression of an opinion is, that it is robbing the human race; posterity as well as the existing generation; those who dissent from the opinion, still more than those who hold it. If the opinion is right, they are deprived of the opportunity of exchanging error for truth: if wrong, they lose, what is almost as great a benefit, the clearer perception and livelier impression of truth, produced by its collision with error. ~John Stuart Mill, On Liberty