1. So other people see you
2. So you can see
3. Its cool, everyone is doing it ;)
Use your high-beam headlights at night whenever it is legal and safe.
All the time
Headlights and wipers.
use your low bean headlights
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.
No, you should not use high-beam headlights at all in heavy fog.
Night time.
Streetlights are not relevant to headlight use.
when its dark, dummy
How far should headlights shine?
In fog you should use dipped headlights or front fog lights. Also you should use high intensity rear ( fog) lights.