If a heavy truck's windshield is shattered by flying gravel on an expressway, completely blocking forward visibility, what immediate actions should the driver take?

1. Remain calm, look through unbroken glass sections or open the side window for vision, activate hazard flashers, decelerate smoothly, and pull onto the emergency shoulder
2. Slam on the service brakes immediately and stop in the center travel lane
3. Punch out the entire glass windshield with both hands while driving at 90 km/h
4. Accelerate to clear the gravel storm area before looking for a shoulder