+1 on the stoopid DRL’s that are only the front lights. So many cars in bad weather with no rear lights on as the automatic lights are only front DRL’s.
That’s ‘cos they’re Daylight Running Lights, the emphasis being on Daylight; the purpose to make cars more visible when oncoming in daylight with poor visibility, like rain or mist, or just flat lighting conditions like you often get in autumn and winter. It’s not necessary for cars to have their taillights on in those sort of conditions because you’re approaching from behind, relatively slowly, unlike approaching head-on.
Of course, the human/machine interface falls on its ass when conditions get really poor and drivers fail to turn the full lights on, but that also applies to the same sort of jackass who just leaves their rear fogs on all the time, just in case, like.
Personally I find that a damned sight more irritating than front fog/driving lights on when it’s not foggy, I use mine sometimes on unlit roads, just because they highlight the nearside curb making it easier to place the car when oncoming headlights dazzle
