When driving an empty or high-sided van truck across a high mountain bridge or viaduct exposed to severe crosswinds (横风), what immediate action must the driver take upon feeling the steering pull sideways?

1. Grip the steering wheel firmly with both hands, reduce speed moderately, and make gentle, progressive counter-steering corrections into the wind without overreacting
2. Slam the service brakes immediately and jerk the steering wheel hard in the opposite direction
3. Accelerate to maximum speed to cut through the crosswind airflow faster
4. Shift the transmission into neutral and allow the wind to steer the vehicle