The new exhibition hall is also located on the Swiss Federal Railways tunnel running parallel to and north of the motorway. The covering is being built wide enough for a third tube to the south of the existing motorway, which is planned for the end of the 2020s and will be con-structed using a cut-and-cover construction method. As the motorway can only be closed for installation during the night, the covering structure is largely being constructed using prefabri-cated construction methods (prestressed concrete girders) with in-situ concrete additions. The contract is being handled in an engineering consortium together with Amberg Engineering (tunnel construction, motorway logistics) and Seger Ingenieure (works management, surround-ings & coordination).