N05 Twann/Douanne Northern Bypass Tunnel (Environmental Services)
Client / Awarding Authority
Federal Roads Office (FEDRO/ASTRA), Estavayer-le-Lac, Switzerland. Tel: +41 58 461 87 11, Email: marchespublics.estavayer@astra.admin.ch.
Open procedure; deadline 24 April 2026.
Project Scope
Environmental engineering services (RIE) for detailed design (DP) and environmental monitoring (SER) during tendering and construction phases of the Twann/Douanne northern bypass.
The services include integration of environmental mitigation measures into design, and supervision of compliance with Swiss regulations covering noise, groundwater, soil and ecological protection. The project involves coordination with existing infrastructure between Twann/Douanne and Wingreis, including construction of a new partial interchange and extension of the existing Ligerz (Gléresse) tunnel.
Tunnel Characteristics
- New road tunnel, length 1,925 m
- Extension/connection to existing Ligerz (Gléresse) tunnel on N05
- Drill-and-blast excavation anticipated
- Includes portals, safety systems and interchange connections
Contract Value
Not stated.
Duration
01 July 2026 to 31 December 2039.
Location
Twann/Douanne – Wingreis, Canton Bern, Switzerland.
Further information:
https://www.simap.ch/fr/project-detail/7cd9135a-0a18-4e9f-8421-51b7ef58181d?lot-id=null
https://ted.europa.eu/en/notice/-/detail/160206-2026, OJ S 047
Ref. no. N05.70 MP-080012.
