N04/06 Road Upgrade Schaffhausen Süd - Herblingen

As part of the “bottleneck removal“ programme the N04/06 which is currently operated with two-way traffic will be expanded into a four-lane motorway. The core part of the upgrade is the 1.4 km long Fäsenstaub II Tunnel as well as the two-level road in the cramped inner city of Schaffhausen.

As an alternative to the quick implementation of the upgrade project a safety tunnel will be designed for the existing Fäsenstaub I Tunnel. The project will be developed in close coordination with Schaffhausen municipality and canton as well as respective federal authorities.

Main Data

  • Support to the overall project manager with project management, project coordination and administration, process management and controlling
  • Technical support in coordination of the subprojects for construction, environment and operating & safety systems with specialist support from ASTRA
  • Cost, schedule and quality management in compliance with ASTRA standards
  • Financial planning according to ASTRA requirements


ASTRA (Federal Roads Office) Winterthur Branch


IUB Engineering AG in consortium

Construction period


Construction costs

CHF 473 million

Scope of services

Owner’s engineering services for the general project upgrading the N04/06 road and for the implementation project for the Fäsenstaub safety tunnel