Under Article 82 of the Implementation Regulations, when a vehicle breaks down or crashes on an EXPRESSWAY under normal clear weather, what is the mandatory placement distance for the warning triangle sign?

1. At least 50 meters behind the vehicle
2. At least 150 meters behind the vehicle in the incoming traffic lane (车后150米以外设置警告标志)
3. Directly beside the driver's side door
4. 20 meters ahead of the front bumper