A "heads up" from Ohio, I assume the laws are similar elsewhere, but who knows for sure. A friend of mine got pulled over and a subsequent seatbelt ticket. He was wearing his 5 point Simpson SFI race harness at the time. How can this be, you ask? Simple, according to the state highway patrol, that particular harnes is NOT "D.O.T." rated, and therefore doesn't count as a seatbelt.
Food for thought. Let's be careful out there.