The old (existing) Karavanke tunnel was closed due to a malfunction of the ventilators. Problem is partially fixed and ban is now only for buses and trucks over 3.5 tons.
This is one of the reasons a second Karavanke Tunnel is being built. Not only as a second lane in each direction, but also as an alternative in such cases.
https://cdn.24ur.com/novice/slovenija/pozor-predor-karavanke-bo-predvidoma-dlje-casa-zaprt.html
cover tunnel photo by: Matt Brown from London, England / CC BY
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