That's because they're wired according to DOT regulations. It's not
legal to drive with fog lights only, nor with fogs and high beams. While
the former can be useful in extremely snowy weather (when driving at LOW
speeds), the latter is completely pointless, since fogs and high beams
serve two entirely different purposes that are mutually exclusive.
BTW, it's also illegal - not to mention inconsiderate - to drive with
fog lights or other auxilliary lights when they're not necessary for the
Or is your aim simply to irritate other drivers?
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