At BIBA - Bremer Institut für Produktion und Logistik GmbH a project was conducted for the electronic vehicle identification in cooperation with the firm J.H. Tönnjes E.A.S.T. GmbH & Co. KG. The aim of this research project was to find the optimal combination of inlay and reader for a passive RFID system in the UHF frequency band. RFID vignettes and RFID license plates produced by the Tönnjes company group were analysed and optimised throughout the tests.