[WERA]

If you're winning money and cliaming your racing as a business then you are transporting the race vehicle in exchange for those winnings. Basically if you always lose or don't claim the racing as a business you technically should be legal (joking about the losing thing, the attempt will get you nailed by the DOT).

As Kirk said, you may have issues arguing it on the side of the road if it's just a hobby.

On the signage - they'd lose that one in court for smaller decorative stickers, unless of course they require all of the manufacturers to not put their logos on vehicles. Of ocurse you'd setill have to be a hobbiest, not claiming anything anywhere as a business. I can't see your choice of decoration for your private vehicle with no pay to do so being a cmmercial venture - and yet again you're the one who has to argue with the DOT on the side of the road. I prefer to make my life simpler and hang banners when I get to the track.