Controversial Gap Filler: Construction of Riederwald Tunnel Begins - Frankfurt's €1.5B Riederwald Tunnel breaks ground after 30 years of delays

Frankfurt's long-awaited Riederwald Tunnel has finally received the green light for construction. The 1.1-kilometre underground route will connect the A66 and A661 highways, easing traffic on the city's eastern edge. With a budget of €1.5 billion, it marks the largest urban highway construction project ever undertaken by Autobahn GmbH in Hesse.

Planning for the tunnel began over three decades ago, with the initial approval process starting in 1989. Despite years of delays, Autobahn GmbH has now secured both political and legal clearance to move forward. The project, however, has faced resistance from environmental groups concerned about its impact on local wildlife, particularly the rare Heldbock beetle.

The tunnel will stretch beneath Frankfurt's Riederwald district, filling a 2.2-kilometre gap in the highway network. Once complete, it is expected to significantly reduce congestion for residents. Construction will be carried out by a joint venture of Wayss & Freytag Ingenieurbau AG, Bickhardt Bau SE, and Implenia. Work is set to begin shortly, with completion targeted for 2033. The project's scale and cost reflect its importance in improving Frankfurt's transport infrastructure.

The Riederwald Tunnel will link two major highways and cut travel times for thousands of drivers daily. Its completion in 2033 will mark the end of a planning process that has spanned more than 30 years. The project also sets a precedent for balancing large-scale infrastructure with environmental safeguards.