 US pilot evaluations of unregistered system have often shown to be too costly to operate, although this method has worked quite successfully on Highway 407.In Austria, "ASFINAG" ("Autobahnen-und-Schnellstraßen-Finanzierungs-Aktiengesellschaft"), the Austrian financing provider for and operator of motorways ("Autobahnen") and expressways ("Schnellstraßen") uses a video tolling system called Videomaut ("Video Toll").It covers parts of three motorways which are subject to special tolls ("Sondermaut") in addition to the regular tolls paid through a road-tax disc ("Vignette") for vehicles with a total weight of no more than 3.5 metric tonnes.