Taken from WA Drive safe manual
and you should have read this to get your drivers lic
Quote:
3.3.3 Driving in fog or smoke
It is difficult to see clearly when driving in fog or smoke. Don’t put your lights on high beam as this only lights up the fog or smoke and makes the road more difficult to see.
In fog or smoke you should:
dip your headlights so you can see more easily;
drive slowly;
not follow closely behind another vehicle; and
use your fog lights if you have them.
Do not use fog lights incorrectly. It is illegal. If your vehicle is fitted with fog lights (either on the front or rear) you must only have them on in fog or other hazardous weather conditions that reduce visibility and not have front fog lamps and headlights on at the same time.
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basically you are only allowed to run two forward facing lights in built up areas at any time, same rule applys to spot/driving lights.
If you drive into fog bad enough that normal headlights create a blinding white sheet in front of you, you should turn fog lights on and headlights off allowing you to continue at a reasonable speed.