
Hmmm . . . I honestly can't see how having your main lights on or off is going to make any difference in the legality of fog lights (although there is a passage in the road rule about being able to turn off your main lights if you have functional fog lights - in fog. This might be a ploy to try and convince police they are fog lights rather than "Driving lights" which are definitely illegal near other traffic ).
That said,
afaik, fog lights are illegal to have on unless there are "inclement conditions" ( i.e. fog or rain ).
In any case, just *don't* be like f***** SS commodore owners who run with them on all day, every day, with every last one of them pointing upwards and blinding you . . .