National Road B 31 – The Realization of a Privately Financed Project
|Conference:||IABSE Symposium: Improving Infrastructure Worldwide, Weimar, Germany, 19-21 September 2007|
|Published in:||Improving Infrastructure Worldwide|
|Total no. of pages:||8|
One of the first privately financed projects in Germany was the national road B 31 East between Freiburg and Kirchzarten. This infrastructure project not only helps realize an efficient traffic concept but permits a further development of the infrastructure of the city of Freiburg as well.
As a direct result of the project, the overground East-West traffic is drastically reduced. This is achieved by directing the main traffic underground. Two double-cell tunnels (850 m and 1230 m) and two noise insulation galleries (275 m and 640 m) were planned. These have been built in the inner city part of the project. The outer city part of the infrastructure project consists of five bridges including a number of noise insulation walls.
The tunnels have been constructed using both the ‚cover and cut’ as well as the ‚cut and cover’ method. High security standards have been applied including a very sophisticated traffic control system.
These aspects, which are of importance in densely populated areas, are outlined in the paper.
infrastructure concrete bridges tunnel privately financed project