Comment by Flocular

I think this is trying to solve delivery inside cities. However, I don't see cities beeing clogged by parcel delivery services. Transportation of goods is more problematic on the inter-city level. But that's too far to build a tunnel. What is causing troubles for cities seems to mostly be human traffic (that's why rush-hour is a thing) - for that subways could indeed be a solution. Unless Switzerland's traffic is looking completly different from what I know from Germany of course?