When a driver intends to change lanes, turn, or pull out from a parked position, what mandatory routine must be followed?

1. Check interior and exterior mirrors, check blind spots by turning the head, activate the turn signal, and verify clearance before moving
2. Activate the turn signal and turn the steering wheel simultaneously without checking mirrors
3. Sound the horn twice and accelerate into the desired lane immediately
4. Check only the interior rearview mirror and proceed if no large trucks are visible