Delhi Traffic Police advises commuters to drive carefully in dense fog. Use tail lights, clean windows and mirrors, and use defroster and wipers. Ensure lights, brakes, tyres, and heating system are working. Keep high-visibility jacket and torch in car. Use low-beam headlights and fog lights for visibility. Maintain safe distance, use pavement markings as guide. Honk periodically and avoid overtaking. Turn off music and stay alert.