What is the very first priority action a bus driver must take when an automated engine bay fire alarm triggers on the highway?

1. Open the engine hood immediately to inspect the flames with a flashlight
2. Safely steer the bus to the breakdown lane or off the roadway, stop the vehicle, engage parking brakes, activate hazard lights, open all passenger doors, and order an immediate, orderly evacuation
3. Continue driving to the next scheduled passenger destination 50 km away
4. Increase speed to blow out the flames with headwind