This is very interesting, John.  The lack of injuries from cars takes some of the influence away from the arguments by bicyclists for separate bike lanes on roads.  In fact, since the top cause of injuries is other bicyclists, then as there are more, and closer together, one would expect more injuries. 
Marc Brenman
mbrenman001@comcast.net

---

From: "John Z Wetmore" <john@pedestrians.org>
To: "TRB Health and Transportation" <h+t--friends@chrispy.net>
Sent: Wednesday, January 23, 2013 7:26:24 PM
Subject: Re: [H+T--Friends] A Data Question


The second interview on Episode 110 of "Perils for Pedestrians" on
bicycle engineering also gets into the causes of bike crashes.  The
top causes, in order of importance:
-other bicyclists
-debris
-potholes
-hills
-turns
-animals
-inattention
http://www.youtube.com/watch?v=2PqYJfvwGcI

As others have said, the majority of non-fatal bicycle crashes do not
involve motor vehicles.  You can pick up the more serious incidents
with ambulance or hospital data, but a lot of bruises and road rash
are treated at home and would only be picked up by a survey of cyclists.

You see a similar pattern with pedestrians.  Most fatal incidents
involve motor vehicles, but falls result in more hospitalizations
among the elderly.

John Z Wetmore
john@pedestrians.org
Producer of "Perils For Pedestrians" Television
      www.pedestrians.org
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