It sounds good, but in practice this is not always the case.
Particularly in conditions of poor visibility, if the windscreen
wipers are going, if the brakelights and fog lights are positioned
close together, if there is a lot of other stuff to concentrate on
too. Travelling at a safe distance you may not be able to distnguish
the fog lights from the brake lights as distinct and separate lights.
Visually ( to my eyes at least) putting two lights of the same
intensity next to each other does not make me register a doubling of
brightness, at least not in daylight.
A third brake light helps, but then you may not know that the car in
front doesn't have one of these until it is too late.
--
Stewart Hargrave
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