Speed limit reduction
And this is probably the best reason for reducing the speed limit to 20 mph in urban areas, since autonomous braking is really only effective up to about 30 kph, at which point it's a mitigation tool at best.
Volvo's camera system will track, spot, and react faster than us in and it's about time such systems are mandatory fit. Sure, you won't prevent or eliminate all accidents, and no doubt the feel-the-road lobby will complain about increased risks from people not paying attention, but the evidence is now there.
My experience with autonomous braking is that it reacts very late, and leaves the smallest gap possible between it and the object it's avoiding. If someone goes into the back of you... well, that's their fault.
I bought a Volvo after the salesman challenged me to run him over in the dealership car park, a task I attempted with gusto but ultimately failed at.
(I would, if running the country, obviously balance out the 20 mph in built up areas with a new 40 mph limit on the quieter main roads).