Really? What do they look like?

An igloo cooler on wheels, more or less. They are sized for sidewalk travel, not street.

[edit] Here's a brief video that shows what they look like.

http://www.cnbc.com/2017/04/21/robots-are-now-deliving-food-...

Huh, that looks very interesting, thanks. For some reason, I keep thinking those robots look like they're one wrong turn away from being dismantled by thieves in seconds...

I'm sure you're right. This other video claims it isn't a problem, but (simply my opinion here) it watches more like SV bubblethink than something based in reality. We'll eventually see, one way or the other.

https://www.youtube.com/watch?v=UPZwnc_Lk2M