The "fog" lamp on the Euro spec Supra's are required by the French IIRC. (And possibly some other Euro countries that deal with very thick fog on a regular basis.)
My A8 has one built into the left tailamp, and if you turn it on, it automaticly turns on the front fog lamps too.
Note that this ONE lamp is supposed to be quite a bit brighter than your running lamps, more like the brightness of a brake light. The idea is to give the guy behind you a chance to see you in fog. If you have two of them, they might be mistaken for brake lamps due to how bright they are.
On the subject of CA laws and living there, I grew up in Ventura county, and I don't miss it at all. Idaho has slightly colder winters, and the summers are about the same, but the people and the laws in this state are totally less liberal than CA. (Thank the environmentalist liberal left for your restrictive laws on what you can, or cannot change on your car. Heck, the really radical ones think you should not even own a car. let alone drive it on a daily basis.)
Whacko's in my opinion. (Let them ride busses and light rail... Oh wait, they all need SUV's and live in 15,000 sq. ft. houses with only 1 kid because they are rich, well educated and well, they just need the large house and big vehicle... but YOU should conserve energy, live in a condo or 20 story apartment building that is solar powered, made from recycled tires and make sure your old car does not polute their air...oh wait, everyone's air.... Oh, I'm just thinking out loud, I'd better sit on my huge redwood deck and watch the sun go down over my private beach here in Malibu...Oh, even better, let's light a fire, and have a BBQ in the pit down on the beach. Who cares that my burning wood in this fire pit creates more polution than your car will in a year, it's my beach dang-it, and I want to roast weenies.)
Environmentalist + Liberal = Hypocrite.