Gildas Le Bever
Directeur de projet - BU Ville, Route et Mobilités
Published on August 06, 2019

Reading time : 3 min

L2 bypass in Marseille: putting BIM to good use

Rocade L2 Marseille

- Crédits : SRL2 - Laurent Carte

This project, of which 60% of the distance is in a cut and cover tunnel, was highly complex, notably in terms of visibility and disciplinary interfaces. The project’s decision makers and some production teams remained unsure of what BIM, which hitherto had relatively few references in line infrastructure, could contribute to design. We therefore had to win them over first.

Visibility and interface management

We worked together to define and stabilise the items that might lead to setting reasonable goals for 3D modelling. From the design of the project to construction and even to operation, BIM facilitates the management of interfaces between the multiple constraints of the site such as existing structures or the numerous underground utility networks. On this type of project, it is essential to be able to prioritise the issues in order to avoid major and unavoidable conflict before starting work.

Traceability and trust

In addition, using the digital model in project phase as a virtual site visit tool constituted an asset towards the government services to prepare the safety audit. This collaborative working environment which encourages and leads to the sharing of reliable information, naturally brings about a climate of trust. It is very rewarding to be able to guarantee that work will progress according to plan by simulating certain construction phases in virtual mode.

In a sector subjected to constant changes in regulations, BIM offers an exceptional opportunity for adaptation, analysis and consolidation whilst ensuring that technical requirements and environmental constraints are taken into account. For the Marseille L2 bypass, the level of finalisation was such that BIM won over all the teams working on the project, in particular those of the contractors. The recent commissioning of the bypass, complying with all the expressed requirements, furthermore served to confirm confirmed that while this project was generic in purpose, it was no less unique.


These BIM practices, introduced on the L2 project, are now fully incorporated into our road design production processes, insofar that the entire project team today designs, checks and manages interfaces in the 3D digital model. This process helps us gain in efficiency, on the condition that, as we did on L2, we target precise control or dynamic modelling standards.



This reference helped Egis become the first winner of the BIM d’Argent award in the Infrastructure category at the second edition of the BIM d’Or awards in September 2015.



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