Equipped with intelligent safety technology according to the latest standards, both core structures in the southern section of the "Nordstrooss" are among the most modern tunnels in the world. The central tunnel construction division of Max Bögl in Arge was responsible for the realisation of the 2,966 metre long Grouft tunnel (completion 2010) and the 1,850 metre long Stafelter tunnel (completion 2013). With the commissioning of the motorway, the journey time between Luxembourg City and the municipality of Mersch, north of the capital in the Alzette Valley, will be reduced to around 20 minutes.
Grouft and Stafelter road tunnels
Large station on the "Nordstrooss". On 23 September 2015, the "Route du Nord", the A7 northern motorway, was officially opened in Luxembourg after 18 years of construction. The last section of the north road, which runs over 33.3 kilometres from Kirchberg to above Diekirch, between Lorentzweiler and Waldhof, with the Grouft and Stafelter road tunnels, went into operation.