What should you do when another vehicle is following you very closely?

Move to the left and slow down to make it easier for it to pass
Speed up so you're not holding it up
Pump your brakes to tell them to drop back
Put your hazard lights on

If a following vehicle is too close, the correct response is to "keep left and allow them to pass." The main purpose of this rule is to ensure driving safety and prevent rear-end collisions caused by tailgating. Maintaining a sufficient following distance while driving is crucial for reducing traffic accidents.