DRLs must be accomanied by auto lights otherwise they are of no use at all.
in certain cases/weathers auto lights are not as clever as they should be, on certain cars if you have cloudy but bright and raining conditions the lights do not come on, but if its stormy and dark with pouring rain the lights come on and the drls dim,
the part I found strange at first was when lights are on auto so is main beam and when a car is seen from opposite direction they shut down to dipped, when no cars are coming main beam comes on again, personally auto main beam is a step too far as they sometimes just switch back to dipped in time not to blind oncoming drivers
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