A quick personal experience....
While I have never really thought about self driving cars before, little bits of the technology have started filtering down to my level...the latest big red Lorry that I get to drive 'progressively ' at work has an additional thing added to the ABS system. It presumes that the Lorry, a Scania, is being driven by a haulage firm with an articulated trailer, laden with goods. Ours never is though, it's got between four and six people on it, with 1250 litres of water and a lot of kit on board, trying to get from A to B safely, in the least amount of time possible.
Now, when it enters a roundabout, the weight goes forward and right, onto the front offside corner, then as you make the manoeuvre, it transfers to the front near side corner, before completing the roundabout, where it moves back to the offside and shifts a bit rear wards as you accelerate out. A 'normal' big red Lorry allows this to happen, and your skill as a driver allows the manoeuvre to be completed safely. The new models, however, sense the shift in weight, assume your load will be shifting, and slam on the brakes, just enough that you lose your correct line, and either head towards oncoming traffic, or roadside furniture, neither of which you want to do.
There is another bit getting added to new appliances from April, I believe, which stops the driver from crossing the white lines ......picture the scene when that happens!