When driving in heavy rain, waterlogged roads, or dense fog in urban areas, what defensive driving adjustments are required?

1. Drive faster to escape the rainstorm zone as quickly as possible
2. Reduce driving speed, increase following distance to at least double normal distance, turn on low-beam headlights/fog lights, and avoid emergency braking or sudden steering
3. Turn on high-beam headlights in dense fog to reflect blinding white light
4. Tailgate large trucks closely to use their slipstream