Das Baugrund Institut Dipl.-Ing. Knierim GmbH from Kassel secured the contract for the construction of the Riederwald tunnel (1095 m, 1025 m) on the connection between the A66 motorway and the Frankfurt ring road A661. For further on Ted tender, please click here. Contact Hessen Mobil - Strassen- und Verkehrsmanagement Zentrale, Wiesbaden, tel +49 611/366-3309, fax +49 611/366-3435, email miglena.brehl@mobil.hessen.de. Ref.n. VG-0459-2020-0064. 01/21.