On an autocar where seat belts are fitted, what should you require of seated passengers before moving?

1. Belts are optional on coaches because professional drivers are exempt
2. Passengers use the belts where they are fitted, and you do not start harsh manoeuvres while people are still standing to stow bags
3. Only the front row must belt; tour passengers behind the driver are exempt
4. Belts may be tucked behind the seat so the 100 km/h motorway rule still applies