30.03.2022 | Opening of the Diez Tunnel in Rhineland-Palatinate

After almost three and a half years of construction, the inner-city tunnel in Diez was opened to traffic on March 12, 2022. It was ceremoniously opened as part of a citizens' festival. At 335 m, the tunnel forms a section of the B417, which serves as a connection to Koblenz/Lahnstein and also links the town of Diez to Wiesbaden via the B54. The tunnel relieves the town center of Diez by routing the B417 through the Geisenberg.

The tunnel is divided into approx. 200 m of cut-and-cover construction and approx. 135 m of mining construction. It passes under the Gießen-Koblenz railroad line twice along its entire length. Both the maintenance of rail operations by means of auxiliary bridges during the construction work and the inclined cut-through at the east portal were special challenges in this project.

The execution planning was carried out as a planning consortium. EDR was in charge of the planning consortium and the design of the tunnel using the mining method. The engineering offices RBZ (excavation of the tunnel using the open cut method) and WTM Engineers München GmbH (tunnel using the open cut method) worked together.

The costs for the construction of the tunnel are estimated at around 39 million euros.

(c) Alfred KUNZ Untertagebau