Higher comfort and more reliability for all "cardCars". Also here the golden rule applies: ?No driving without reservation!? (see article about the new intelligent lockers). In everyday life this has mainly one big advantage for the customer: The car opens its doors much faster. Because of the "reservation-check" the radio information, who may drive this car at what time, is normally already on board. Exceptions may be due to a spontaneous last minute reservation. A not yet registered reservation SMS would then be automatically required by the on-board computer at the reservation server in Bremen. Satisfying detail for connoisseurs of the subject: the same occurs, if an SMS got lost in the electronic jungle of the D-net.