[marshray]

What if the passengers decline to produce drivers' licenses?

Should the driver be guilty of violating the carpool lane if it turns out one of the passengers had a suspended license or were uninsured?

What about a passenger who is validly licensed yet legally drunk? They couldn't legally drive a car.

What about passengers with valid licenses who have no car? What if they have a working car but its tank is empty and they have no money to buy gas. They're not reducing congestion either.

[pinko]

I don't really care; if we were writing the law we'd figure out a reasonable but inevitably imperfect policy for each question. The point isn't to get every possible situation right. It's to come up with the best-bang-for-your-social-buck heuristic.

[marshray]

I think whether or not passengers in a car pulled over for "driving in an HOV lane with suspected unlicensed passengers" are required to produce valid drivers licenses on demand is pretty important.