Volvos are Swedish and are obviously made to drive on Swedish roads.
The geography of Sweden is that they outside of the summer months, they have days that have long periods in the dark, due to Swedens proximity to the Artic circle.
It is the law in Sweden that you must always have your lights on, as a saftey mesure, so Volvo (and Saab) just make sure the lights come on when the car does.