Re: Helmets to be required in Seattle
johnfoss wrote:
> This indicates only an incomplete set of data. Any accident figures
> used before and after enaction of seat belt legislation must include
> figures for compliance to be meaningful. If only 5% more people are
> wearing seat belts at the time, the numbers don’t really mean much
> yet.
Well, I have no data. I couldn’t find them. The statistics on the DfT
website don’t go that far back.
I’m not aware that there was a serious issue with non-compliance, but I
was too young to have been greatly aware of it at the time (the
legislation was introduced in the early eighties). I remember that the
legislation was very well publicised and that the police were expected
to enforce it vigorously in the early days.
The legislation referred to was a requirement to wear seat belts when
travelling in the front of a car if seat belts were fitted. I know that
even now there is significant non-compliance with the requirement
introduced sometime in the nineties to wear a seatbelt in the back of
the car, but that wasn’t as well publicised. (Not that publicity should
be an issue, as the law is made very clear in the Highway Code, which
all motorists are expected to have a thorough knowledge of).
Anyway, I’m straying from the topic. Sorry.
> I notice nobody has argued the benefits of seat belts in cars. Maybe
> because it’s off topic? I know, I know.
I think the only relevance of the stats following seatbelt legislation
is that they provide good evidence of risk compensation, which in turn
is a good argument against mandatory cycle helmet legislation. And when
I argue about helmets I’m not arguing against helmet wearing per se, but
against mandatory helmet legislation.
> The letter starts … with the a mention of how helmets
> can cause injuries as well as prevent them. To what percent? If it’s
> 50% you have a compelling argument. If it’s 10%, it should be noted
> that helmets aren’t perfect (nobody thought they were).
What percent of what? The percentage of crashes where a helmet causes
injury? The percentage where a helmet increases the severity of an
injury? These would, of course, be useful data to have, but then we’d
also need to consider the type of crash and what injuries may have been
prevented, and to rank the severity of injury somehow. Unfortunately
good, controlled, studies seem to be very rare in helmet research.
Nobody can even say what proportion of crashes are reported. Also
unfortunately I no longer have access to a university library to look up
papers
Whether the limited statistics are considered useful or not it is still
worthwhile to consider all of the risks and benefits associated with
helmet wearing and the mechanisms associated with those risks and
benefits. My letters sought to mention important risks that the DfT had
apparently not considered.
> The letter claims that images of helmeted cyclists give the impression
> that “Cycling is dangerous.” Is this based on any survey or other
> data? To me a helmet does not indicate danger.
Graeme has already answered this. I won’t write any more, except to
mention that my second letter raises an objection to the DfT’s campaign
aimed at 10-14 year old boys. The x-ray images
http://www.cyclesense.net tend to evoke extremely negative emotions in
people outside the target audience.
> When I advocate helmet requirements for unicycle competition it is to
> protect the organizers from liability, and to present a responsible
> image.
I think that comes down largely to cultural differences between our
countries. But my letters refer to general riding, not to competition.
Even for competition I would tend to advocate freedom of choice,
although I took on board a comment made recently by one of the TdF
riders (Jens Voigt IIRC). He mentioned that the discomfort of wearing a
helmet can have an adverse affect on performance (particularly in hot
weather), and that this put helmeted riders at a disadvantage compared
to their unhelmeted colleagues in the peloton. The result was that
riders would have to think long and hard about wearing a helmet, as long
as helmets were not required.
The greatest encouragement that I’ve seen for helmet wearing has been
while watching pro cycling, but of course they take risks that I would
never dream of taking.
> The author of the letter also unscientifically concludes that in his
> case he would be more likely to crash while wearing a helmet, so he
> chooses, for his own safety during the summer months, not to wear one.
> He appears to be saying he would rather crash less times, without a
> helmet, than more times, with one. Maybe this works, but it doesn’t
> make sense to me.
Of course, I have no way of knowing for sure that discomfort adversely
affects my concentration, or that the resultant adverse effect on
concentration will make me more likely to crash. I’m pretty confident
that reduced vision resulting from sweat in my eyes will make a crash
more likely.
A helmet will only protect against head injury (although at least one
study is supposed to have found that helmets were effective against
lower limb injury). A crash could cause injury to any part of my body.
The closest I have ever had to a life-threatening injury was when I was
caught at the base of the sternum by a bar end. An inch lower and I
could have been killed (think ruptured heart or liver) - no helmet could
have prevented it. So yes, I would much rather avoid crashing in the
first place than protect myself against a limited set of possible
consequences of having crashed.
> Sorry to attack that letter specifically, but as an offered example of
> reasons to oppose helmet legislation, it has little to offer. It needs
> work to make a convincing argument.
I recommend looking at one particular reference from the letter,
http://www.cyclenetwork.org.uk/papers/broader.pdf . This was written by
John Franklin, author of Cyclecraft and widely recognised as the UK’s
leading expert on cycle safety.
> What makes a much more compelling case for me is Tom Holub’s notes
> about how the numbers of deaths and injuries for motorists and
> pedestrians are far greater.
This certainly is compelling, and I’d add:
http://bmj.com/cgi/content/full/321/7276/1582
> The issue is, and I believe the studies support this, that
> helmets save lives. That is the reason to wear one, if you choose to
> do so.
I have no doubt that helmets save lives in certain circumstances. I’m
not convinced that there’s a net saving, though. You are, and the data
available aren’t good enough to really judge either way, one reason for
the ultimate futility of helmet threads.
> But in deciding if everyone should have to wear one, pointing away
> from cycling to other activities is neither compelling, nor
> convincing, as an argument.
Agreed. For that reason I made no more than passing mention of this
argument in my letters.
> I am only in favor of mandatory helmet laws (for adults) if they
> remove the burden of health care for accident victims from the general
> population.
The British Medical Association is opposed to mandatory helmet
legislation, on the basis that the resulting reduction in the number
people cycling is likely to do more harm to public health than any
benefits from helmet wearing.
> People who ride
> motorcycles on the freeway, for example, and then have one-bike
> accidents, are being irresponsible if they aren’t wearing a helmet.
I wouldn’t ride a motorbike without a helmet even if helmets weren’t
mandatory. But of course I don’t pedal on a motorbike, so sweat is less
of an issue.
I have read some convincing arguments against mandatory motorbike
helmet legislation, though, on the bases that spinal injuries and
torsional brain injuries are significantly increased and, more
significantly, that a lot of death and paralysis tends to be caused by
untrained first aiders removing a crashed motorcyclists helmet at the
roadside, rather than waiting for the paramedics to come along and
stabilise the neck. I don’t have a reference to hand, I’m afraid. I
believe this one may be relevant, but I haven’t read it:
Corner, J P et. al. - “Motorcycle and bicycle protective helmets:
requirements resulting from a post crash study and experimental
research” Federal Office or Road Safety report No CR 55, Canberra, p5
(1987)
> What about those Rugby players, anyway?
We’re back to cultural differences now. I understand that rugby players
across the pond wear full body armour and take a break every 15 minutes
for the adverts
–
Danny Colyer (remove safety to reply) ( http://www.juggler.net/danny )
Recumbent cycle page: http://www.speedy5.freeserve.co.uk/recumbents/
“He who dares not offend cannot be honest.” - Thomas Paine