What is the correct maneuvering sequence when a runaway heavy truck experiences total foundation brake failure on a mountain descent and reaches an Escape Ramp (避险车道)?

1. Steer smoothly into the center of the gravel arrester bed, keep the steering wheel straight and firm, brace for impact, and apply parking brake once stopped
2. Swerve hard across the gravel bed at a 90-degree angle to slide the truck sideways
3. Jump out of the cab door 5 meters before the truck enters the escape ramp
4. Honk the horn to signal the escape ramp operator to activate a magnetic crane