The tunnels of the 1,800 km Swiss national road network are among the safest in the world. However, standards and guidelines evolve continuously. The Swiss Road Authority (ASTRA) is addressing this with
a comprehensive rehabilita-tion program (2010–2020).
Most of the measures specified by the Swiss Tunnel Task Force report in 2000 for improving tunnel safety have already been implemented. However, the standards and guidelines for road tunnel safety installations have been updated to reflect new experience and scientific results. The latest changes became effective in 2004.
According to an...