Under the Provisions on the Administration of Road Dangerous Goods Transport (MOT Order 2013 No. 2, as amended), what rules govern parking dangerous goods transport vehicles during transit?

1. Vehicles must park in designated dedicated hazardous goods parking spaces, avoid densely populated areas, schools, and water source protection zones, and maintain a safety separation distance of at least 50 meters from other hazmat vehicles
2. Vehicles may park anywhere, including underground shopping mall parking garages and kindergarten gates
3. Vehicles must park directly under high-voltage electrical transformers for security
4. Vehicles must park in the middle lane of expressways with engines idling