[mxfh]

They are purpose build for door to door postal letter delivery, sturdiness and low maintenance. Top speed is quite irrelevant and electric motor assisted operation is how is compensated for the weight and terrain. They are legal on bike paths since they are throttled to 25km/h so they still classify as normal bikes.

Unrelated, they do manual powered boats too: http://www.dpdhl.com/de/presse/pressemitteilungen/2017/start...

[Gravityloss]

German post office delivery river boat. How cool is that? I could see this becoming a "must have" thing in the San Francisco bay. ;)

[beamatronic]

You'd have people living in them to save on rent. And they'd make them self-pilot around the Bay to avoid the whole marina-liveaboard limitation issue.