The 45km Simplon Pass between Brig and Iselle is one of the most important transit routes through the Swiss Alps, and with 2,500 vehicles passing through its numerous tunnels, galleries and bridges each day along this stretch of the Swiss national highway, its 1970s construction was beginning to show its age. The 500m long Schallberg tunnel at the start of the pass, not far from Brig, was submitted to a complete renovation taking 2.5 years, including construction of new escape tunnel and a ...

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