Self-driving

Self drive can work on railways where the permanent way ahead is totally secure.  But roads are definitely not securely fenced, people and animals can cross and step into the path of a vehicle.  Greenwich park had a demonstration self drive bus which anyone walking could overtake as it was programmed to detect anyone within a few metres with laser beams which would then stop the bus. Dogs, flying pieces of paper anything would bring it to a halt. 

A self drive car in busy high street would never ever be able to pull away from the curb.

Self drive can work on railways where the permanent way ahead is totally secure.  But roads are definitely not securely fenced, people and animals can cross and step into the path of a vehicle.  Greenwich park had a demonstration self drive bus which anyone walking could overtake as it was programmed to detect anyone within a few metres with laser beams which would then stop the bus. Dogs, flying pieces of paper anything would bring it to a halt. 

A self drive car in busy high street would never ever be able to pull away from the curb.

I think you're a few years behind the state of the art.  There are now self-driving Waymo taxis in Phoenix Arizona.  At the moment, they can only go on roads that are precisely mapped, but they are driving around on public highways with all the other traffic.

But they do get totally confused by road works.

I understand, but I mean a Tesla branded vehicle and not another branded vehicle. I hope you agree with me that the design of different systems (the manufacturer programs the systems according to its designated tools) ?