When driving a passenger coach on an expressway during sudden severe smog with rapidly dropping visibility, how should the driver avoid multi-vehicle pileups?

1. Activate fog lights, low beams, clearance lights, and hazard flashers; decelerate progressively; track the right-side lane marking; maintain generous following distance; and exit the expressway at the first available ramp
2. Speed up to 110 km/h to escape the smog patch before it thickens
3. Slam on brakes and stop dead in the center lane immediately
4. Tailgate an ambulance or police car with high beams on