I believe CA, and many other states, require an on-the-road driving test once a driver hits 70. I think I read the driver in this incident (86) did not for some reason. Reading accounts of this in the news bummed my day (9 fatalities including a 3 year old + 40 injured).
Now, let's try to get the rest of the incompetents off the road (under 70).
Sherwood Lee
http://members.rennlist.com/911pcars