What are the driver's duties when assisting a passenger in a manual wheelchair over a deployed bus boarding ramp?

1. Let the passenger propel themselves up the ramp unaided while the driver watches from the doorway
2. Secure the vehicle with the bus stop/parking brake, verify the ramp is fully seated and locked, push the wheelchair forwards up the ramp (or backwards down the ramp for safety), and ensure the wheelchair is properly positioned in the bay
3. Ask another passenger to handle the ramp so the driver can stay at the controls
4. Deploy the ramp before applying the parking brake, so the stop takes less time