Under Chinese traffic safety rules, what is the safe protocol for a heavy truck driver intending to overtake a slower vehicle on a two-lane rural highway?

1. Verify clear forward visibility in the oncoming lane, signal left turn, sound horn, accelerate smoothly to pass, and ensure full trailer clearance in right mirror before merging back
2. Flash high beams and immediately tailgate within 2 meters of the preceding vehicle before swerving out
3. Overtake on the right shoulder while sounding the horn continuously
4. Overtake while crossing solid double yellow lines if the preceding vehicle is an agricultural tractor