All the time
Headlights should not be left on while the vehicle is not in use. If you are not driving, you will just drain your battery while having your headlights on.
Use your high-beam headlights at night whenever it is legal and safe.
Headlights and wipers.
use your low bean headlights
Use your high-beam headlights at night whenever it is legal and safe.
No, you should not use high-beam headlights at all in heavy fog.
At night time or 30 min after sunset In Illinois they are also required when wipers are in use.
you must use your headlights between one-half hour after sunset to one-half hour before sunrise, or anytime when person or vehicles cannot be seen
All the time mostly when it is raining or it is dark
It depends upon driving condition (not time)
Streetlights are not relevant to headlight use.