Viaduct Knínice, which is situated near a small village Kninice, is formed by two parallel bridges of the length of 1,027 m and 1,077 m. Since the viaduct continues into the tunnel of Libouchec, the transverse gap between the bridges varies – from 0.90 to 9.00 m. The bridge decks are formed by spine girders with large overhangs. The girders, which have a variable depth from 1.40 m at midspan to 2.60 m at supports, were incrementally cast span-by-span in the formwork supported by an underslung movable scaffolding.