On Wed, 27 Feb 2019 21:11:38 +0000
RJH wrote:

On 27/02/2019 10:55, Rob Morley wrote:

https://helmets.org/walkerstudy.htm

Interesting, thanks - the issue is shifting between academics every
few years. The original has taken quite a kicking, but the original
data seems to keep getting reworked.

The latest (this month) supports the notion that drivers drive closer
to riders with helmets - but with a number of caveats and emphases.
It's not available electronically yet - so even if I could understand
it (unlikely) I've not read it.

I think the issue is probably best described as 'undecided'.

Indeed - lots of "not as obvious as common sense might suggest" issues
to be considered. The best that can be done is to try to help people
make an informed decision for themselves (or their children) while
showing that it's far from clear and simple, particularly at a social
epidemiological level.