Many things are prohibited to drivers directly. Anyone who drinks at the wheel gets into trouble with the police. There are no extra laws for other behaviors, but they can not only lead to accidents but also to a nodule. For example, when a woman is putting on make-up at the wheel or you start to feed a baguette with both hands.
No one else notices other things, but they can still be dangerous. For example, if the passenger brings a briefcase between himself and the airbag.
If an accident occurs after careless behavior, insurance benefits can even be reduced. Fully comprehensive insurance in particular gets in the way if risky behavior was involved. It then accuses the driver of gross negligence and refuses to pay. However, there is protection: insurance companies with premium conditions pay even if they act negligently. Then you can take off your sweater while driving.
Of course you shouldn’t do it.