Based on the successful MFK 500 front arm series the tunnel washer was adapted in order to meet the special requirements of professional tunnel maintenance: a standard telescopic arm enables important cleaning heights and the lateral shift makes it easier to adapt the equipment to the conditions in the tunnel. The transport position of the arm in front of the vehicle offers an easy park-out and park-in function even in narrow tunnel cross sections. Through the hydraulic swivelling device of the brush, the tunnel washer is ready for operation swiftly.