Following a highway traffic collision involving a passenger coach, what is the mandatory sequence of actions for the driver regarding scene safety and emergency reporting?

1. Immediately turn on hazard flashers, set warning triangle at ≥150m, evacuate uninjured passengers safely behind the outer roadside guardrail (护栏外), dial 122/110 and 120, report precise kilometer marker / direction / casualties, and preserve digital tachograph/monitoring data
2. Argue with the other driver in the middle of the highway to determine fault
3. Tell all passengers to remain seated inside the disabled coach on the active highway lane
4. Leave the scene immediately in a private vehicle to avoid traffic police questioning