[_xo_]

I am not sure how true this is anymore. As far as I am aware, for example, a lot of the equipment necessary for using tunnels as bunkers in case of war has been abandoned or removed.

At least in Germany, in the past a lot of bridged also were prepared to be blown (especially those to the east). I think this is no longer true for anything that was built after ~1990.

[hga]

Doesn't matter as long as Switzerland responds to any changes in its strategic posture. E.g. that equipment, plenty of which is a wasting resource, can be replenished if its neighborhood gets threatening again.

[dm2]

Yep, and since the invention of guided missiles that could just as easily destroy the bridges and tunnels the explosives have become redundant, too expensive, and not worth the safety risk.