What should a driver do when driving in thick fog (niebla densa) in Chile?

1. Turn on high beams (luces altas) and drive in the middle of the road
2. Reduce speed drastically, turn on low-beam headlights (luces bajas) and front/rear fog lamps, follow right-side edge markings, and never stop on the active traveled lane
3. Follow the car ahead as closely as possible to use their taillights
4. Turn on hazard emergency flashers and drive at maximum highway speed