Speed Camera Detectors to be Banned!

1. Why is accuracy necessary?
2. What percentage of vehicles involved in accidents have ABS?

 

Rather blame something else than their own stupidity for getting caught.

 

That's what I thought but didn't realise so many people could be so stupid.

 

Following up to Brimstone

Maybe i'm going back to the wrong post but as far as I can see
people are well aware they speed because they wish to.

 

Following up to Brimstone

the issue is they are not happy with the low speed limits, not
that they are unaware you wont get fined if you don't speed.
Most of the people here don't seem to get tickets, they probably
have GPS's!

 

The question was whether or not it is possible to tell the free running
speed of a vehicle before impact.

Neither of your points have anything whatsoever to do with that.

 

I cannot be bothered to pursue this pointless debate typical of somewhere
like Sussex.

 

You seem to have a problem with reading things in context. Go back and
re-read the thread.

 

Please - don't give the Labour State any more ideas

 

Correct - I always like cold, hard facts when I see them.

Always good to hear relentless self-denigration at work, too - it
greatly reduces the competition .

Uk roads, despite the moaning and whining, are very safe - the
motorways are about the safest in the world.

(I think I have the quotation right) Well that's just bullshit. I
can't find the thread in my newsreader, but when I last checked the UK
was second only to Denmark in terms of child road deaths. Child
pedestrian deaths are not so good; the order of countries from best
(least deaths) to worst (most) goes broadly in line with population
density, with an extra death "kick" if you live anywhere in Southern
Europe, where the drivers are suicidal and murderous in equal
proportion. Even the Germans like to kill nearly three times as many
people on their autobahns as the British do on their motorways - but
then murderous activity from that part of the world shouldn't be
*completely* surprising, should it.

 

Could you explain how they determined the speeds at the point of impact?

 

This is the part I'm referring to:-

So I repeat, "Who is forcing him to break the speed limit?".

 

I was told by Sussex Police AIU that they have huge amounts of data from
TRL on vehicle characteristics in crashes. Stuff like how they crumple
and by how much. From that they can use basic physics to work out the
speeds. It's not 100% accurate but it is, apparently, pretty bloody
close.

 

There have been on every ABS system I've had and as 'most' ABS are made
by the same Japanese company and are re-badged when fitted to individual
makes of car I assume the same is true with 'most' cars and bikes.

 

This has a hint of circular argument by the Cops

The crash is bad because of the high speed. We know they were going at
high speed because of the level of damage.

 

Maybe, but... personally, I have never met a Traffic or AIU (since
renamed to "Crash Investigation Unit") officer that has that mentality
(YMMV). All of those that I have spent time with have been guys with a
genuine love of driving and who do understand the real cause of crashes.
However, what they say in private and what they have to say officially
may be quite different things

 

Do the TRL crash all models of cars at various speeds
into objects and dummies to build up the database?
(If so, it is a lot better than www.euroncap.com ).

If it is based on 'real' crashes, could you explain how they
determined the speed at the point of impact?

 

I would hazard a guess that they go further back into the process than that.
The amount of force needed to deform, or break, a given thickness of a
material is known. Similarly any deformation resistance added by the shaping
of that material is known. From this basic data I would think that close
estimates can be made of the amount of deformation that will take place at a
given speed can be estimated.

Crashing a couple of cars into solid objects will then confirm the
hypothesis and the data passed to investigators can be modified accordingly.

 

No it's basic physics.

That's not how the approach speed of vehicles is determined. If the
investigators consider that the speed of the vehicles in the collision
is such that a criminal investigation is warranted, they will accurately
survey the position of the vehicles after the crash including their
'attitude' that is which way up they are and which direction they are
pointing. They will also measure skid marks and determine the
deformation of the vehicles.

Then they can use software provided by TRRL to model the approach speeds
and road position of the vehicles to give an accurate reconstruction of
the incident. All the TRRL software does is to use the inputs given to
calculate probable trajectories and approach speeds until it finds a set
that leads to the final position of the vehicles.

 

So you guess that the speeds are based on calculations
about the strength of materials just after manufacture?