Define “bus”:

1. A motor vehicle designed to transport passengers on hire on route service lines that are indicated within its registration document only.
2. A motor vehicle designed to transport eight passengers besides the driver, and has valid registration documents.
3. Correct answer: A motor vehicle designed to transport at least eight passengers apart from the driver, and is indicated as a bus within its registration document.
4. Any vehicle permitted to transport more than ten school children.

WhyA bus is a motor vehicle designed for at least eight passengers besides the driver, registered as a bus in its documents. Without that entry, an eight-seater is not yet a bus.