Under what circumstance may vehicles involved in an accident be moved before the arrival of the police?

1. When the drivers agree that neither is at fault.
2. When no persons are killed or injured, the material damage is slight, the vehicles are still driveable, the drivers agree on the accident circumstances and draw an agreed diagram signed by both, and then attend the authorities to have it recorded — or when moving a vehicle is vital to take an injured person to hospital in the absence of an ambulance.
3. Whenever the accident occurs during peak traffic hours.
4. Whenever one of the drivers has an urgent appointment.