Motorway – Diversions for the SEA HSL

Motorway – Diversions for the SEA HSL

As the main design consultant on the SEA (South-East Atlantic) HSL between Tours and Bordeaux, SYSTRA analysed motorway diversion and slip road modification or construction requirements.

SYSTRA produced a total of seven design studies – six for the A10 and one for the A85 – which took account of traffic constraints and concessionaire requirements.

This design project was carried out between 2010 and 2015 on behalf of Project Manager, VINCI, and involved sections ranging between 650 m and 1250 m in length.

SYSTRA’s missions

A kilometre long diversion was set up on the A85 motorway between Vierzon and Montbazon around Veigné.

The following measures were taken on the A10 motorway:

  • Two major diversions were introduced to create enough room to build cut-and-cover tunnels at Migné-Auxances and Fontaine-le-Comte, and the Poitiers North motorway interchange was modified at Migné-Auxances.
  • Introduction of lane changeovers and platform extensions. Planning construction work schedules for the flyover at Ports-de-Piles
  • Redesign of the Sorigny motorway interchange
  • Construction of new access roads to the Jaunay-Clan service area and Cents Septiers rest area, which had to be moved due to construction work on the high speed line.

One of SYSTRA’s strengths lay in the Group’s ability to produce geometric designs that conformed to safety and equipment standards (horizontal and vertical road markings, road safety barriers), and define road and platform drainage requirements.

SYSTRA acted as consultant to the parties working on the SEA HSL project thanks to its understanding of railway construction constraints and ability to incorporate these into motorway diversion designs.

SYSTRA provided:

  • Assistance technique
  • Geometric and technical designs for all 7 projects
  • Recommendations on the choice and positioning of road safety barriers in accordance with regulatory requirements
  • Horizontal and vertical road markings
  • Drainage requirements for roads and the surrounding area
  • Visibility assessments including stopping distances in accordance with regulatory requirements.

SYSTRA also helped to produce operating procedures for use during the road works. Its experts worked on the:

  • Project Phase
  • Planning Studies Certificate Phase.
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