In the last decades the Amsterdam agglomeration has experienced an impressive growth. It now accommodates more than 2,4 million citizens. To serve the growing traffic, the Coen Tunnel was built. The Coen Tunnel is a submerged 2 x 2 lane tunnel in the A10 motorway under the North Sea Canal in western Amsterdam. The tunnel has been a great success. In 2005 more than 100,000 vehicles were passing daily.
At that time the Coen Tunnel was also the biggest bottle neck in the entire Dutch highway network resulting in road congestion even outside during peak-hours. It not only had a negative impact on the daily life of commuters but also created environmental problems. That is why Rijkswaterstaat, the Dutch General Directorate for Public Works and Water Management decided in 2006 to build a second submerged six lane tunnel. The so called ‘2nd Coen Tunnel Project’.This under the terms of a Design, Build, Finance, Operate and Maintain contract.