Whether or not you get a speeding ticket should really be up to you and whoever else was driving that stretch of road at the time. I think as long as it’s ok with the parties involved, no big deal.
Let the drivers decide.
Even then, in his hypothetical...
for a speeding ticket, you likely have a registered speed gun, recording the speed. Your speed is then pretty much a hard to dispute "fact".
Value (or speed) in the Trump case isn't easily factually discernable until the property is sold. It's an ever-changing opinion, until a sale makes it somewhat factual. Even then, if distressed, the sale value could be understated as to true market value.
Actually, the one comparable in the Trump case would be if the officer asked Trump how fast he thought he was going.
Trump: "Ahhh...66?"
Officer: "Actually 75. And now that you've opined you were going 66, and I've determined based on my math you were going 75, you'll receive a speeding ticket, and a summons for public trial later for fraud by misrepresenting your opinion of speed."