Robocars - Autonomous Drive, Self-driving, Driver-less cars

I have been reading about this for a while now. They are already on the road in California trials. All kinds of interesting aspects to this. I have to think that computers, if they can fly/land an airplane, they can drive a car better than many of the people now on the road.

I'm all for it! Was reading somewhere mileage tests (somewhere in the 500,000 miles) had a fraction of an error margin compared to a human. saying that, It came to me that that result was reached while the car drove in a 100% human controlled environment. As in, it was driving with other people.
Imagine how much safer, accurate and efficient that would be if even 50% of the cars in say, California were autonomous. If they communicated with each other, getting off a motorway junction would be spectacular no matter the speed, even if you're in the fast lane. All the cars near would accommodate each other in perfect flow.
Take that to an inner city and it'd be even more amazing. It'd be all timed so perfectly, there would be no need to cars to simply roam around.
Taxi's for example (tough subject) you need one pronto? it'll just be parked around the corner, couple of taps on your phone, car there in a few seconds, parking space immediately gets occupied by another empty car. Nothing would be wasted. Dump inductive charging into the infrastructure if the cars were electric, and bam, super clean cities.
Of course, I have no idea if the systems for this are available or not, or if they can be implemented or if they even will considering how many jobs autonomous cars will eliminate, but I guess it'll be interesting to see.

Just a couple of thoughts.