Under what atmospheric condition must a driver in Angola refrain from using high-beam headlights (luzes de estrada / máximos)?

1. In heavy fog, snow, or thick smoke, because high beams reflect off water droplets/particles and create a blinding white glare wall
2. On completely dark, open, deserted rural highways
3. When driving alone on an unlit secondary road
4. When travelling above 80 km/h on an empty highway