Do they work without the headlamps on dip?

Yes they work with just side lights on. But will also work with headlamps, but in thick fog headlamps are useless as they just reflect and reduce forwards vision.
 
Yes they work with just side lights on. But will also work with headlamps, but in thick fog headlamps are useless as they just reflect and reduce forwards vision.
that means having just one would definitely illegal.
 

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