When a heavy truck driver experiences total service brake failure on a mountain descent and identifies an emergency escape ramp (避险车道) ahead, how should the vehicle be steered into the ramp?

1. Align the vehicle smoothly into the center of the ramp entrance, grip the steering wheel firmly with both hands, and steer straight into the gravel bed without making sharp turns
2. Swerve violently back and forth across the gravel bed to maximize friction against the side curbs
3. Apply the trailer hand brake hard and steer sideways to intentionally flip the truck on the entry ramp
4. Attempt to turn around 180 degrees at the ramp entrance to roll back uphill