47 km sewerage tunnel across the Ruhr area
A clever solution: What is normally a road tunnel turns into a storm water relief tunnel during floods. The storm water management and road tunnel in Malaysia is the answer to two challenges.
Greatly varying geology required different driving methods during the construction of the Uetliberg Tunnel in Switzerland. The 4.4 km long road tunnel connects the Birmensdorf bypass with the existing national road Zurich-Chur.