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By John Neary (registered) | Posted November 29, 2010 at 18:01:57
@SpaceMonkey: seancb asked four specific questions about the data you cited:
Any answers?
I might add that whenever I've glanced at studies on the relationship between one-way/two-way traffic flow and pedestrian collisions, I've been quite disappointed in the methodologic quality -- no matter the conclusion of the study. I don't think there's been a single randomized study on this subject. Most of the studies either compare one-way streets to two way streets at a single point in time, or look at collisions on a group of streets before conversion between one-way and two-way. Few of the former correct for street characteristics, and few of the latter include a control group of streets that didn't change between one-way and two-way. Many studies on this subject don't correct for traffic flow, and I don't know if any correct for pedestrian flow. In other words, we should probably all back off a bit on this subject, unless someone can cite some studies with proper methodology.
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