When a passenger coach breaks down on an unlit highway at night, what vehicle lights must be illuminated according to Article 60 of the Road Traffic Safety Law Implementation Regulations?

1. Hazard warning flashers (危险报警闪光灯), clearance lights / outline marker lights (示廓灯), and rear position tail lights (后位灯)
2. High-beam headlights and high-power roof searchlights only
3. Interior passenger cabin dome lights only, with all exterior lights extinguished
4. Left turn signal only