When is a bus driver obliged to display an identifying document?

1. At the request of a policeman only.
2. Only when a municipal inspector files a complaint against him.
3. When an income tax clerk requests to see his stock of tickets.
4. Correct answer: Whenever required to do so by any bus passenger.

WhyA bus driver must show an identifying document to any passenger who asks. There is no need to wait for a police officer or a complaint.