All national vehicles ( i.e . motor vehicles and their trailers ) exceeding 3.5 tonnes are exempt from vehicle tax , if - during that calendar month - they are used exclusively for initial and terminal haulages for combined rail/road transport , i.e . the pick-up from and delivery to the nearest technically suitable terminal of containers ( of a length of at least 20 ft ) , swap bodies or semi-trailers transported by rail . On request , national vehicles exceeding 3.5 tonnes using the rolling road technique ( RoLa ) or ( in case of semi-trailers ) unaccompanied combined transport on Austrian territory are reimbursed 15 per cent of the monthly vehicle tax for each combined transport journey effected by rail .