You might notice I quoted the two conditions in which it is legal to use fog lights, depending in which part of the country you live this may mean you may never use your fog lights, or maybe a couple of dozen times a year, and even then their usefulness is questionable, dip beam often being better anyway, especially modern lights with a sharp cut off, so why do most modern cars have them, and if they were replaced by spot lights, correctly wired of course, would it then be legal to use them, even if fitted at the height of fog lights, an why?
