BVerwG, Beschlüsse vom [DATE] [REF] , NJW [DATE] , 0, und [DATE] [REF] , Buchholz 0 [DATE] , Verkehrswesen, [REF] , Nr. 0, S. 0 ; OVG NRW, Beschlüsse vom [DATE] 0 A 0/0 , [DATE] [REF] , 0. Januar [DATE] [REF] , [DATE] [REF] , und [DATE] [REF] , NWVBl. [DATE] , 0 .