Back on near topic, well still under the first word of this thread..
There is the issue of bullying.
This could / will happen with a mix of selfish driver and perfect highway code programmed driver-less cars.
I can see this occurring at any time I guess (for a laugh) but the most likely scenario is where there's an obstruction on one side so traffic has to wait for a gap in the oncoming flow to take their chance and get by.
Quite often there is some give and take in that a courteous driver on the clear side will slow a bit and allow a few cars through. Then you sometimes get the tail gater who pushes that give and take a bit too far and takes the piss getting through.
The driverless car could be so polite and not take those opportunities that a riskier driver would.
Same thing applies to the narrowing traffic calming sections where one lane has priority. We have quite a few of them down here. Pretty annoying things as they cause congestion and pollution to solve a problem of inappropriate speed (well according to the speed limit laws anyhow).
If we ALL drove sensibly they would not be needed, then again neither would speed humps, and a lot of the road furniture we current have.
Insurance is an interesting thing. The driverless car will no doubt be able to prove exactly what happened in a collision with a plonker-self-driver. They could also collect data on dangerous driving by same plonkers and I guess record speeding where they overtake or pass on dual carriageways / motorways etc breaking the law. As it's no doubt calibrated data it could be used in a plethora of ways.
Our whole boy racer road use mentality could change fairly quickly. Currently the speed limit / highway code etc is seen as there to be broken / plonker knows best, unless they are likely to get caught by plod car, fixed or mobile camera.
Interesting seed change that could introduce. The driverless car might not be so defenceless after all!