on my ls there is no indicator light to tell you if the front fog / driving lights are on or not. so it's really easy to turn them on when conditions dictate and then forget to turn them off.
my understanding of the difference between fog and driving lights is that fog lights are below the bumper's horizontal center line whilst driving lights are above. e.g. the old 80's xr2 / xr3i had driving lights whilst bmw drivers have foglights with the switch superglued to on.
i'm with those who think that a fine for this kind of thing is a good idea. i drive up to birmingham on a regular basis and in the rain some sections of the m6 are a nightmare. no road lights, rain, and idiots with fog lights on. i can hardly see the road infront of the car never mind accurately judge the distance to other cars. they are FOG lights not drizzle, rain or pose lights.
cheers
julian.