The function of the auto lights is all covered in the manual guys, as soon as you pop over approx 100mph on motorway they will come on and not go off till you have done about 5 mins of driving below 60 kmph.
The lights will also come on as stated after the 4th constant wipe of the windscreen wipers either in there auto mode or constant mode.
Other than that they can be a bit annoying at times when its a dark day or your going through a tunnel etc