The Auer bypass in South Tyrol is a landmark infrastructure project that provides long-term relief to the town center by diverting through-traffic. The 5.4 km bypass was delivered with a strong focus on environmental compatibility and technical precision, combining cut-and-cover and conventional (drill-and-blast) tunnelling with open-road sections.

At its core are three tunnels excavated in porphyry rock using conventional tunnelling methods: Castelfeder (995 m), Montan (128 m) and St. Daniel (1,062 m). The alignment is complemented by a cut-and-cover tunnel between the Castelfeder and St. Daniel sections.

The open-road sections were implemented with a landscape-sensitive approach to ensure seamless integration into the surrounding environment. In the sensitive Castelfeder Natura 2000 area, extensive monitoring ensured that vibrations and settlements remained below critical thresholds and that the natural lakes were preserved.

Our detailed design and construction management, together with structural site supervision, ensured the highest safety standards. State-of-the-art systems—including noise barriers, an automated jet-fan ventilation system, emergency escape routes and comprehensive video surveillance—provide safe and efficient traffic operations.

The Auer bypass combines technical innovation with sustainable environmental protection, offering a forward-looking solution for the region.