Under the Implementation Regulations of the Road Traffic Safety Law of the PRC (Article 82), what is the minimum distance for placing the reflective warning triangle (警告标志) behind a disabled vehicle on an expressway?

1. At least 150 meters behind the vehicle in the direction of oncoming traffic (and ≥ 200 meters in low visibility/night)
2. At least 10 meters behind the vehicle
3. Directly on top of the driver's cab roof
4. 5 meters in front of the front bumper