Philip TAYLOR PC87S/O-XP said:Quoted message said:Speeding, however, is. There is a large and growing body of evidence saying that (a) driving at
significantly above the median speed for a road is associated with greater risk of crashing
(significant being 15-20% or more);
Quoted message said:I would completely agree with this; it is the /median/ speed which is important, not an arbitrary
figure set by a local authority
Median speed on a 30mph road is about 30mph, on a motorway it's a shade under 60. Speed limits are
there for a reason, and the motor lobby fought tooth and nail against their introduction. The reason
is that left to their own devices motorists rouutinely drive too fast for the conditions, partly
because they overestimate their own skill and partly because while the benefit of driving fast
accrues entirely to the driver the risk is distributed among other road users, so the cost / benefit
from the motorist's standpoint comes out strongly in favourt of driving fast.
Quoted message said:police. If you travel south on the M3 when traffic is not excessively heavy,
About 3am from my experience, and the median speed in my lane was 135 back then. I don't do
that any more.
Quoted message said:By selecting the appropriate lane, and by matching your own speed to that of the prevailing
traffic, you will do far more for road safety that by blindly following a "<= 70 : good ; > 70
bad" rule.
And by obeying the speed limit so all the lanes are under 70 the total level of danger is reduced,
for the simple and obvious reason that KE
= 1/2 mv^2. You also increase the effective capacity of the road;
optimum capacity is around the 60 mark from memory.
Quoted message said:Quoted message said:(b) those who have several speeding convictions are also more likely to have been involved in
crashes;
Quoted message said:Yes, I don't dispute that for one instant, but not does it conflict with my earlier assertion that
(using your terminology) those who have several speeding convictions probably tend to drive
dangerously as well as speed.
But it does undermine the assertion that speed cameras are not targeting dangerous drivers - they
may not detect dangerous /driving/ (that would require my new patent Twatso[TM] camera) but they
plainly do detect dangerous /drivers/.
Quoted message said:(c) probability of fatality rises roughly with the
Quoted message said:fourth power of impact speed - and so on.
Quoted message said:Certain as /a/ power of impact speed : not certain I would agree with the fourth powet without
doing a little more research.
Luckily Joksch has already done it for us and revealed that the power is 4 ;-)
Quoted message said:Quoted message said:Speeding is dangerous, and suggesting it isn't is one of the more dangerous pieces of
self-delusion we practice when we drive.
Quoted message said:The problem is, "speeding" is open to interpretation.
Not according to the Road Traffic Act...
Quoted message said:If you mean "exceeding the statutory limit", then I disagree
Evidently, but the evidence is against you.
Quoted message said:There are two reasons why I disagree with the first interpretation :
Quoted message said:1) speed limits are arbitrary : German autobahns are little different to our own motorways, yet
unless posted to the contrary, there is no speed limit on them.
They also have higher fatal accident rates. Across a wide range of countries and sites, reduction of
average vehicle speeds results in a reduction in fatal serious injury crashes.
Quoted message said:2) speed limits should be seen as guidance, not rule
Absolutely not. I am entirely in favour of less arbitrary mechanisms for setting limits, but I can't
imagine anything more dangerous than allowing drivers to decide to drive faster than the limit -
remember, most drivers overstimate their own skill, and while all the benefit of going fast accrues
to the driver much of the danger accrues to others. This flaw was recognised when mandatory speed
limits were introduced, and it hasn't changed.
Quoted message said:the local authority make no distinction between residential and semi-rural stretches.
I could name areas where speed limits are equally arbitrary, but I still observe them.
Guy
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