What is the core defensive driving principle for commercial heavy vehicle operators in dense highway traffic?

1. Asserting vehicle size to force smaller cars to yield at all times
2. Maintaining total situational awareness, managing large space cushions around all sides of the vehicle, anticipating erratic maneuvers by smaller cars, scanning mirrors every 5-8 seconds, and driving at safe speeds compatible with loaded stopping physics
3. Tailgating passenger cars to encourage them to drive faster
4. Flashing high beams continuously to clear the passing lane