“A huge lot of stuff came down. The road was covered up to seven metres deep.”
That is a big ass controlled avalanche by any standard. It was triggered at 4pm on Saturday and miraculously cleared for traffic midday on Sunday, which is a testament to Swiss snow removal.
The mitigation work was in preparation to open the 2,429-metre high Furka Pass for summer operation, it remains closed during the winter because…well just look: 
images from wikipedia
