The Gyűrűsárok viaduct on the M6 Motorway was built between 2008-2010. Each carriageway has a separate bridge divided by a gap. The superstructures are prestressed box girders. The substructures are hollow section piers founded with high diameter bored piles. The continuous multispan superstructures were incrementally launched by the aid of a steel nose. The parallel construction cables are grouted internal cables, while the additional cables for the final stage are unbounded external ones with double protection, led in the inner of the box girders on deflection saddles.