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?
Originally Posted by
myrridin
I suspect that there isn't likely to be a statistical difference in poor operation characteristics for either mode... And more to the point it doesn't matter if the point of this thread (as the OP requested) is to discuss poor cycling behavior in an attempt to improve the education/behavior of cyclists. Given the focus of the board I think it is a safe assumption that participants are cyclists... JF's post is on the point of the OP's thread--what do cyclists do wrong...
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%