Is a bus driver permitted to smoke while driving?

1. No, except on touring rides only.
2. No, except on a touring ride, when the passengers are foreign citizens and with their consent.
3. Correct answer: No.
4. Yes. The driver is separated from the rest of the passengers and therefore is permitted to smoke any time.

WhyNo, a bus driver may never smoke, on any trip. A bus is a public place; a partition or the passengers' consent changes nothing.