[SystemSafety] Bicycle Helmets

[Matthew Squair]

Likewise I have a bicyclist friend who was hit by a car and her helmet
saved her from severe brain trauma.

This was her second bad concussion from riding within the space of a couple
of months, and as we found out the only thing the brain likes less than
being shaken vigorously is having it done again.

Fuzziness of the data notwithstanding, if we agree that helmets provide say
'-x' degree of risk reduction, but in the two populations the proportion of
injuries is still roughly the same, then we could conclude there must be
some source of additional risk equal to 'x' that helmeted riders are
exposed to? If so what is that risk? Or am I missing something?

Matthew Squair

MIEAust, CPEng
Mob: +61 488770655
Email; Mattsquair at gmail.com
Web: http://criticaluncertainties.com

On 15 Oct 2014, at 6:52 am, Peter Bernard Ladkin <
ladkin at rvs.uni-bielefeld.de> wrote:



On 2014-10-15 00:01 , David Crocker wrote:

I have some indirect experience of the value of cycle helmets.


David's story is similar to what happened in one of the two incidents to my
friend who wrecked two
helmets and her jaw, but in her case it was a lamppost base.

That's the puzzle. The value of helmets is obvious - many of us seem to
know some one or more whose
lives have been saved - but apparently not from the numbers.

PBL

Prof. Peter Bernard Ladkin, Faculty of Technology, University of Bielefeld,
33594 Bielefeld, Germany
Tel+msg +49 (0)521 880 7319  www.rvs.uni-bielefeld.de




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