Guess I'm confused, John.  Below, in your list, you discussed "crashes" and did not differentiate between injuries and fatalities.  I did not "blame the bike-on-bike crashes on bike lanes," I said, "takes some of the influence away from the arguments by bicyclists for separate bike lanes on roads."  You're right, we'd need to know where the injuries and fatalities occurred.  This is an interesting question, "What weight do you put on fatalities versus severe injuries versus minor injuries?" and has been debated a great deal inside the US Dept of Transportation.  They ascribe a certain dollar value to a death, but a severe incapacitating injury has expensive longterm costs for society and the individual.
Marc

---

From: "John Z Wetmore" <john@pedestrians.org>
To: "TRB Health and Transportation" <h+t--friends@chrispy.net>
Sent: Thursday, January 24, 2013 10:17:50 AM
Subject: Re: [H+T--Friends] A Data Question


First, this is injury data.  Most bike fatalities are from crashes
with cars.  What weight do you put on fatalities versus severe
injuries versus minor injuries?

Second, you would need much more detailed data to determine where the
bike-on-bike collisions are occurring.  Are they in bike lanes?  Are
they on trails?  Are they in regular travel lanes?  Do they involve
wrong-way cyclists, who are involved in many collisions with
cars?  Do they happen in pelotons on group rides?  It would take some
huge assumptions to use the aggregate data to blame the bike-on-bike
crashes on bike lanes.



At 11:51 AM 1/24/2013, mbrenman001@comcast.net wrote:
>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
>--------------------------------------------------------------------


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