Originally Posted by
genec 
Ever bother to grade the typical motorist... bearing in mind that their movements are restricted by the width of the lanes and size of the vehicle?
Here's genec with his perennial complaint that motorists are just as incompetent as cyclists, without any proof at all. I presume that he has not bothered to read my paper providing quantitative observations of the traffic behavior of cyclists. I suggest that if motorists operated with the same incompetence as the observed cyclists, the roads would quickly be choked with collisions. Here are some of the error rates for the observed cycling populations.
Stop Sign: no slow, no look: Palo Alto 59%
Stop Sign: no look: Palo Alto 22%
Left Turn: wrong start position, no look: Palo Alto 65%, Davis 31%
Left Turn: wrong start position: Palo Alto 27%, Berkeley 67%, Davis 56%
Lane Change: not looking: Palo Alto 95%, Berkeley 100%, Davis 93%