|Client||European Investment Bank|
|Services provided||Feasibility Study,Preliminary Design,Detailed design,Tender documents|
|Period of execution||09/2011 – ONGOING|
|Construction cost||€ 240,000,000|
|KEY FACTS / KEY DATA||80 km length
400 m of artificial tunnel
In accordance with the adopted ICTAAL standard, the category of the motorway is L2
The Rocade has the function to:
- create a beltway encircling the urban extension of the region of Grand Tunis, in the medium and long term;
- connect the three existing motorways: A1 to north, A3 to west and A1 to south, and the planned ECOSO (South-West) one;
- cross and interconnect the main radial arterials that originate from Tunis.
It has a length of about 80 km and runs at a distance of about 20-25 km from the city center, serving the main suburban centers of the region and facilitating access to new poles of development on the outskirts of the urban area.
The infrastructure has motorway characteristics with separate carriageways with 2 lanes - extendable to 3 in the future. Access will be controlled through interchanges with all the main intersected roads.
The project, whose specific aim is to avoid the transit of medium/long distance traffic through the congested city center of Tunis, is part of a larger plan of development of the motorway network linking the major urban centers of the country.
This plan is intended to provide the links necessary to structure the development of urban and industrial areas, to reduce transportation costs and increase time savings for users, to reduce the number of accidents and support the development of key sectors of the economy .
THE PROJECT: CHALLENGES AND SOLUTIONS
The identification of the possible alternative corridors has taken into account all technical-engineering aspects (geometric alignment and profile, hydraulics, geology, archeology, etc.) and the socio-economic and environmental impacts.
Situations have arisen where it was necessary to find a compromise between optimal solutions from a purely technical point of view and choices of a social nature, aimed at the satisfaction of public institutions and the representatives of local communities.
To this end, the Consultant has developed and optimized a procedure for evaluating alternatives through a detailed Multi-Criteria Analysis, which made it possible to evaluate a variety of criteria, parameters and indicators, starting from data relating to the current situation. Extensive use of GIS allowed to easily and reliably evaluate and quantify geospatial data, such as land use.
The study of the configuration of the several interchanges has been a complex undertaking resulting primarily from the technical and functional characteristics of the existing roads to connect. The connection to the three motorways for example, required accurate studies regarding the tolling system applied to existing motorways, with tight coordination with the Tunisian Motorways (STA).
The study of the alignment and of major interchanges had to consider carefully the presence of pre-existing archaeological sites. A typical example is where the beltway intersects the Roman aqueduct: the solution chosen not only protects the ruins by remaining at an appropriate distance but also addresses the problem from the landscape point of view providing for an underpass, to avoid any visual interference with the aqueduct.
The study of the structures took into account the aesthetic and architectural aspects of the works themselves. To this end, without falling into a formal eclecticism and given the cultural specificities of zones crossed, it was proposed to refer to the ancient culture of Tunisia and in particular the Phoenician symbols of Tanit. The different treatments have a common guideline: to define a general profile of the structures, a special shape of the piers and other elements of detail. This approach has been widely appreciated by the Steering Committee.
Provided in collaboration with Comète Engineering
- Preliminary study with identification of different corridor alternatives
- Preliminary study of environmental impact with particular reference to the landscape and archaeological aspects
- Preliminary planning for the possible alignments within the selected corridor
- Detailed design of the approved alignment
- Contract documents for construction broken down by lots