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It's not just about power of light source or wiring of after which button press specific lights light on.
It's also (much more so) about specific produced light beam shape, to reduce reflection from dust/snow/mist particles in air (flat and wide but very narrow vertically).
I guess one can get turn signals to lit up with foglights switch, they can produce as much light in lumens .. but if you meant them to illuminate road in fog .. at best they will just produce that "white wall" ahead of car like main far lights in fog or snowstorm.
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