A double-lane motorway tunnel with a length of approx. 3 km forms part of the new motorway section of ‚Route du Nord' in the biggest infrastructure project in Luxembourg. The two tubes were carried out with an incline of nearly 5%.
The Henndorf bypass lead to a noticeable relief of traffic congestion. Centrepiece of the bypass is the double lane 2,150 meters long road tunnel, which is now used by approx. 20,000 vehicles per day.
The Silberberg railway tunnel in the Thuringian Forest is part of the new Ebensfeld – Erfurt railway line. The new line connects the old and the new federal states.