They issue parking violations if a vehicle is parked on the street overnight...
They issue parking violations if a vehicle is parked on the street overnight in front of your house, even if you don't know whose it is. They will fine you and you have to watch what house the driver goes into and fill out a form to say where they went. If you don't know (because it happened between midnight and 5am), you will have to fill out another form to declare that you don't know, and tick a box to promise to spy on them and inform the board once you do know where the driver went.