When meteorological departments issue red or orange alerts for severe freezing rain, heavy blizzards, or dense fog (visibility < 50 meters), what operational protocol must dangerous goods transport enterprises execute?

1. Suspend dispatch of dangerous goods vehicles, instruct en-route vehicles to exit expressways immediately, and park in safe designated parking areas until weather conditions normalize
2. Command all drivers to accelerate to 100 km/h to beat the storm
3. Order drivers to turn off vehicle headlights to conserve 12V battery power
4. Direct drivers to park horizontally across all expressway lanes