A section of the A9 autoroute in Valais has been closed to trucks and a lane closed for cars after part of the road collapsed.
A hole over a meter across opened up between Sierre and Sion - and police admit they have no idea why.
On worries heavy vehicles may cause more problems, any over 3.5 tonnes have to take a detour.
Engineers are now trying to figure out the reason for the collapse.
Increase in burglaries
Burglaries are surging across French-speaking Switzerland, with Geneva the hardest hit canton in the country
Car accident near Geneva
Three men are in a critical condition in hospital after a wrong-way crash this morning on the A40 motorway at Saint-Julien-en-Genevois
Concerns over new Lausanne tram service
Lausanne's new tram is already drawing complaints — before it even enters service
More money for AI experts
Swiss companies will pay most for AI expertise next year, according to a new salary guide from recruiter Robert Half
Another minor earthquake hits Switzerland
A magnitude 3.8 earthquake has struck near the Diablerets in Vaud this morning, felt across a wide area of the Alps
First taste of winter
Winter has arrived in the Alps
