I believe that his 'other problem' was of a cognitive nature, he drove 2.5 blocks through human bodies w/o letting up. I know from first-hand experience that when an accelerator sticks, for instance, panic can cause one to freeze momentarily,

, but after you have mowed down a few people you would maybe turn off the ignition, don't you think?
Unfortunately, this type of accident is all too common among elderly drivers, just usually they do not occur in the worst possible location on earth, a street bazaar or farmer's market.
I do not advocate an age limit for driving, just stricter testing. The political power of the AARP, (growing every year), must be ignored in this case, since their assertions do not agree w/ the facts and science. The retired person lobby claims that "older drivers are no less safe than young drivers, look at accident statistics". The problem is that statistics can lie, when you need them to. Once *miles driven* are factored in, elderly drivers kill more than any other age group. Test them.