Seem to remember back in the 1980's I think it was Gunsons who had a kit where you added uprated brake/sidelight bulbs in place of your standard ones then wired up their gizmo and this gave you normal brake/sidelights for most of the time but when foggy you flicked a switch and the sidelight element in the bulb went much brighter (to give you rear fog lights) and when you put foot on brake the brake element in the bulb went even brighter.
Advantage being you didn't have to bolt an aftermarket rear fog light on your car,leaving back of your car looking standard,but you still had rear fog light. Guess the higher wattage brake light when rear fog light was on fell foul of lighting laws or something as it never really caught on did it.
Think I have an old car magazine in loft somewhere with the Gunsons ad for this kit on the back page
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