When a passenger coach encounters a sudden severe sandstorm or dust storm with diminished visibility on a highway, what should the driver do?

1. Close all windows and cabin vents, activate low beams, fog lights, clearance lights, and hazard warning flashers, reduce speed, and steer clear of tall billboards or lightweight structures
2. Open all windows to equalize cabin pressure with the swirling storm
3. Accelerate to 120 km/h to pass the sandstorm wall rapidly
4. Turn off all lights and stop the vehicle in the fast travel lane