If you're ever driving in a situation where it is possible for a nun or baby carriage to jump in front of your car without any warning, you should be driving at 30km/h (20mph) or less. This gives you a stopping distance of approximately 1 car length, so stopping is always a better option than trying to steer around an obstacle. It also means that any collision with a pedestrian is highly unlikely to be fatal.

Of course, having automated cars driving at 30km/h through the suburbs is going to piss everybody off, but that's better than dead babies.