By that, I mean that if you change your address, you may decide—or you may not even make a decision—not to notify the driver's licence people. You're going to wait until something happens and it's convenient for you to do so.
J'entends par là que si une personne change d'adresse, elle peut décider—ou tout simplement laisser faire—de ne pas avertir le bureau d'immatriculation.