The area where I live is the victim of a delivery robot trial.
There are about ten of these motorised delivery boxes ambling their way slowly, very slowly and erratically, up and down the paths and roads. They do not seem to know what they are doing.
I was turning in to a road when one was crossing and even though I gave it right of way it just stopped. It eventually reversed back onto the path. When I had gone I looked in my mirror and it was still just sat there.
On another occasion one met a woman with a pushchair - it was stalemate for a while with both of them stopped. The woman eventually had to put the pushchair and child into the road to get round the robot.
The thinking is that these will eventually take over from delivery vans. Not a hope in Hell.