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The Project 

The aim of this project was to facilitate bus rapid transit operations on the RN4 main road and A351 motorway between Ittenheim and Strasbourg as part of a local right-of-way public transport project. The first section, between Wasselonne and Ittenheim, was opened in 2016.
The project involved:

  • creating a dedicated public transport lane on a 4.2 km section of the A351 hard shoulder,
  • widening a 4.8 km section of the RN4 to create an extra lane for public transport in each direction,
  • fully dropping the RN4 – RD228 junction to improve safety,
  • these new dedicated lanes were combined with dedicated operating facilities (dynamic signaling, video surveillance, access regulation and control, etc.).

Challenges

Project owner
DREAL ALSACE

Period
2011 – 2014

Key figures
4.8 km of main road widened
42 km of hard shoulder reinforced
Comprehensive interchange design

Challenge
The development of dedicated lanes on the hard shoulder was an experiment that required major consultations with the different stakeholders (road/transport/environmental authorities, the local departmental council, etc.) throughout the assignment to find the best solutions in terms of features and safety.
In particular, dynamic simulations were necessary to design and verify how the dedicated lane would cross the manu interchanges on the highly urban A351 motorway.

The Assignment

The assignment awarded to setec, in partnership with a landscaping company (Chemin Faisant) and an engineering company (SERUE Ingénierie) involved preliminary design and public consultation documents:

  • identification of site constraints and land-use analysis,
  •  definition and monitoring of further reconnaissance (geotechnical surveys, topographic studies and calculations),
  • comparison of variants using multicriteria analysis,
  • detailed solution design (geometry, hydraulics, carriageways, flyovers, operating equipment, etc.),
  • drafting of an impact study,
  • drafting of public consultation documents, including urban planning documents.