A wheel must be changed on a passenger-carrying coach. Which precaution set is correct?

1. Change it in the live lane with passengers remaining in their seats for ballast
2. Leave the engine in gear and the wheels free so the bus can be rolled to the spare
3. Move to a safe place if you can, secure the bus, keep passengers out of the traffic and the jack zone, and use proper chocks and tools
4. Ask passengers to stand on the opposite running board to counterweight the jack