my uncle was pulled over by some random bloke when he didnt realise his foglights were on, this bloke was effing and blinding and my uncle didnt have a clue they were switched on, and the bloke wouldnt take "sorry" and go. he kept on and on... i know its fustrating when theres someone with them on in the day, but if they are innocent and honestly didnt realise, surely thats a good enough explanation