Autonomous vehicle spots hazardous situation, so obeys it's programming and stops.
Human doesn't look where he is going and collides with stopped vehicle.
Which in itself isn't much of a story, despite the giddy attempts of the media to turn it into one..
However it does open the door to the wider issue of autonomous vehicles - such as once the general public figure out that AV's are programmed to stop if they detect danger, how long before there is chaos on the roads as human drivers simply pull out in front of them at junctions, safe in the knowledge that the AV will stop? Or peds step off kerbs in front of them, knowing that they'll stop? How long before we have gridlock beyond anything we see today?
I inadvertently tripped the Autonomous Emergency Braking (AEB) on a taxi the other day - I quite correctly stepped onto a zebra crossing and either the taxi driver wasn't paying attention or didn't feel obliged to stop, but the car did and hit the brakes, hard. Good for me, no doubt but it shows how things are changing.