What is the primary visual hazard when driving at night on unlit rural routes, and how can it be mitigated when facing oncoming traffic?

1. Engine overheating; mitigate by turning off headlights
2. Glare and temporary blindness (encandilamiento) from oncoming high beams; mitigate by switching to low beams and directing your gaze toward the white fog line on the right edge of the road
3. Increased wildlife running toward light; mitigate by accelerating
4. Tire deflation caused by cool night asphalt