The devil’s in the detail. I assume we’re talking about fully autonomous, so the people in the car won’t be participating in the driving at all beyond deciding the destination and, perhaps, choosing ‘quickest or cheapest’.
For me the big question though is “Will all the other cars on the road be driverless ?”. If they will then hurrah ! But if what Sodbury used to call ‘the piss-soaked old nodders’ will still be out there doing 60 in the middle lane then rather than dawdle along behind them all the way from here to Northumberland, which I fear is what the risk-averse software will be prone to doing, I’ll still want to have my hands on the wheel so I can get there before it’s time to turn round and come home again.
Once we take the panic element out of driving (braking because you see an oncoming vehicle, pulling out because you’ve detected a truck in the inside lane even though it’s no closer than Neptune, slowing down to rubberneck an accident on the other carriageway …) traffic should actually move faster than now and I’m all for that.