Papaumau wrote:
The trouble is that all of these arguments go towards the reverse of the slogan, and therefore try to say that "speed does not kill".
Obviously the impact speed is a factor in injury severity, though not the only one. That bears no relation to speed beforehand, and in any event the fact that an impact has even occured invariably means that something else has already gone wrong. That something else may also be speed related, such as driving beyond the limitations of the road or vehicle. More often it will be something else.
Papaumau wrote:
It seems to be accepted that the faster you go the better your concentration is and because of this idea the better your thinking times and reaction times are.
Not quite. I'd say that your reaction times and concentration deteriorate at lower speeds unless there's still some stimulus. I think my level of concentration is about the same on urban roads doing 25-30 as it is on m-ways doing 70. Well, mostly 70. Okay, sometimes 70

Anyway, back to the point. At 30mph on an empty m-way I would expect my concentration to be less than that at 30mph on an urban road.
Papaumau wrote:
Nevertheless, if you are tired and you are travelling at high speed your good OR bad thinking and reaction times are directly related to the distance that you travel during these important seconds or parts of seconds. This distance has been said above to be able to allow the driver to avoid collision, but the actuality is that the faster you go the harder it is to change direction or to avoid a collision. In fact at high roadspeeds the attempt to change direction can actually contribute to the accident itself.
Now you're introducing other factors here, none of which are speed related. Firstly, if you're tired you should take a break. It's that simple. High speed, low speed, so-so speed doesn't enter into it. "Don't Drive Tired" is one slogan that I am in absolute agreement in. When tired drivers kill or injure someone it is their tiredness that is to blame, and that makes it a driver problem.
Secondly, what we might call our safety zone does get larger as speed increases, but again it is a driver responsibility to maintain it. The two-second-rule works for me, though I tend to make it two-and-a-bit in practice. If I can't get a two second gap at 70mph, the solution is simple - settle for 60mph (or whatever). Failing to make this decision would again be a failure of judgement, rather than something directly caused by my speed.
Thirdly, yes, it is harder to avoid a collision at a higher speed, but that's why you increase the gap in the first place. It's supposed to make avoiding action possible at all speeds (providing someone else doesn't enter the gap before you can react, which would of course be their fault, not yours). Again, failing to maintain that gap is failing to drive safely, and is applicable at
all speeds.
Last of all, yes, at sufficiently high speeds an abupt change of direction can cause control loss. However, the solution is simply not to make abrupt steering inputs at high speed. Ah, you say, but what if the car in front suddenly stops? Well, I had a two second gap didn't I, so I still don't have to make a sudden change of direction. A sudden change of underwear possibly, but not direction. Of course, there remains the possibility that someone else will enter that safe area and some drivers may panic and then lose control and collide with someone/thing else. However, this can happen at any initial speed.
Papaumau wrote:
If the concentration has been bad enough due to tiredness at slower speed the accident that results will be developed pro-rata to the speed that you were travelling at the point of impact
Please tell that hypothetical knackered driver to get off the bloody road.
Papaumau wrote:
...Not until it stops. At which point the speed at the point of impact MUST contribute to the level of destruction that results in the stopping.
But
only if there is an impact, which usually there isn't. You've already agreed that if no collision occurs initial speed is irrelevant. What about the millions of times where a collision is avoided, and by that I'm not just talking about near misses but also the millions of drivers on the road at any given second who are doing it right. Looking at it that way we should be as worried about being struck by lightning.
Papaumau wrote:
I am sure that most of you will agree that this thesis suggests that as long as the road or the air is clear that as long as the vehicle is under control, the speed itself is unimportant. As our roads and even our airspace is now becoming more and more crowded the chance of any vehicle finding totally clear airspace or roadspace becomes less and less as it covers the distance that it needs to cover on it's journey.
At the risk of opening a can of worms myself I'd say the situation's probably not as bad as it seems. As far as aircraft are concerned we only have to look at the volume of air available for them to fly around in. Half a billion square km times 30,000ish feet seems like enough room for everyone, so I think the real problem is one of traffic control around airports and over heavily populated areas (because of course there's more airports there). I'm sure there's more to it than that, ATC computers, airline maintenance yadda yadda yadda. But covering that would mean a lot of surfing for info to cover something that is wildly off topic.
On the ground the obvious solution to overcrowding is to build a few more roads, and improve the ones we already have. On top of that let's improve public transport to the point where it's actually a realistic alternative from time to time. (Dr Beeching.....hmm

) Now I know people who would say that we're already covering the country in tarmac, but in fact there's still a lot of room left for major road building. If we simplify things a little and assume that all motorways are 3 lanes wide (i.e. about 30 meters wide) and find out the length of the network (about 3500km according to the ABD site) we get a measily 105 square km of m-ways in a country of over 244,000 square km. That's about 1/24 of one per cent. Okay, there are still problems. We can't just plonk new roads anywhere - potential routes need to be carefully planned out to avoid unnecessary damage to the countryside, plus driving through a lake would create an aquaplaning hazard

. So not everywhere will be suitable, and the surveys to sort out potential routes would take a lot of time. And that doesn't even begin to consider the costs. However, potentially some traffic might be taken off minor roads, which could reduce risks to road users there. Maybe even a few minor rural routes would become obsolete and could be turned into green lanes or bridleways.
Erm, sorry all. I've gone off topic and into a game of fantasy transport network here. I had a point somewhere but I can't remember where I put it.
