If the accelerator pedal on a passenger coach becomes mechanically jammed or stuck in the full-throttle position while driving, what is the correct emergency response?

1. Depress the clutch pedal (or shift automatic transmission into Neutral 'N'), apply progressive foundation braking, steer the bus to the shoulder, stop, and switch off the ignition key
2. Turn off the ignition key instantly while traveling at 100 km/h and lock the steering column
3. Pump the accelerator pedal repeatedly while steering into opposing traffic
4. Unbuckle the seatbelt and crawl into the footwell while driving to pull the pedal by hand