Is 'dancing while driving' a party bus foul?

Q: A party bus drove past me on the freeway, with people standing up -- even on guy dancing next to the front door. Is that legal? -- Don in BurienA: Don, that's a great question. And, there are exemptions to the seat belt law. One of those, which is, 'for hire' vehicles such as buses, taxi cabs, and also vehicles such as construction vehicles, farm vehicles, and vehicles that people consider would be starting and stopping a lot. Possibly like a garbage truck or a mailman. They're exempt from wearing the seat belt. All other vehicles within the state, you're required to wear a seat belt. And, I don't believe it's illegal to dance, while on the bus. -- Washington State Trooper Chris Webb