When a heavy commercial truck approaches a blind crest or sharp bend on a narrow rural mountain road, what is the proper signaling procedure?

1. Reduce speed, keep to the right side of the lane, and honk the horn repeatedly to alert oncoming vehicles
2. Accelerate to pass through the blind zone as quickly as possible before another vehicle arrives
3. Turn on hazard warning flashers and drive in the center of the road to claim right of way
4. Flash high beam headlights continuously while maintaining top gear cruising speed