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PostPosted: Tue Oct 10, 2006 15:51 
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Lets face it.

It's dangerous and pretty rubbish.

anyone who's honest will admit it.


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 Post subject: Re: SPECS and mirrors
PostPosted: Tue Oct 10, 2006 16:44 
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ed_m wrote:
SafeSpeed wrote:
I don't think we've got to the bottom of the way that speed cameras in general and SPECS in particular affect the driving process. Thoughts?


if you were only minitoring with peripheral vision and expecting any action to catch your eye.. perhaps a car sneaking up with a very small differential speed isn't enough action.


That's interesting. It could be a part of the 'mix'; but I'm pretty sure it isn't everything because when driving in the 'active mode', I think the mirror comes up about every 3 or 4 seconds. So we still have to account for the consequences of the 'ultimate passive mode' effect.

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PostPosted: Tue Oct 10, 2006 17:13 
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Ernest Marsh wrote:
Maybe the following drivers latched on to your tail to prevent their plates from being picked up by the first camera?
Were you in the Camper? Big target, hides much of following vehicle? If so, it might not ALL be down to YOUR driving! :shock:


SPECS strategy - every second camera, find a LGV or similar and get close behind as you pass the camera. Can someone calculate how close you need to be to a typical LGV for a typical height of SPECS camera?

BTW, does anyone know, where there are (say) three cameras in a SPECS monitored stretch of road, whether the system measure speed: from #1 to #2 and from #2 to #3; or: from #1 to #2, #2 to #3 and #1 to #3?


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PostPosted: Tue Oct 10, 2006 17:19 
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civil engineer wrote:
I've been using cruise control a lot in the m42 VSL recently and when the traffic is light (and the bl00dy things should be switched off) it's all well and good but during heavy periods cruise control is a nightmare and far more dangerous than normal control.


Cruise control is really inappropriate in congested traffic because the driver loses the ability to use 'acceleration sense'. Speed limiter (as fitted to Mercs etc) is good. Cruise control is excellent in light traffic where little or no variation of speed is needed.


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PostPosted: Tue Oct 10, 2006 17:31 
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I think my current car has that option I'll give it a go.


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PostPosted: Tue Oct 10, 2006 17:43 
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jamie_duff wrote:
{snip}

I get extremely uncomfortable very quickly as I am invariable forced to drive in very close proximity to over vehicles (usually in all lanes). I feel boxed in and get stressed as I flit between making sure the vehicle beside me isn't in my lane and that I'm not drifting over the speed limit.

I try to miniumise this personally by selecting an edge lane (nearside typically), holding back from the one in front (except if I need to obfuscate) and applying subtle speed variations to avoid being alongside a neighbour for any significant length of time. The quid pro quo is more petrol used and slightly less comfortable passengers thanks to the on-off pedalwork.

jamie_duff wrote:
{snip}

I also notice that regardless how I was driving prior to the SPECS camera zone, upon passing the last camera my driving becomes fairly aggressive (3rd gear acceleration up to 80odd) just to get away from all the other vehicles I've been boxed in by for the previous stretch.

In otherwords, I find driving within a SPECS controlled zone a very claustrophobic experience.

:yesyes: I always show them a clean pair of heels too.


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PostPosted: Tue Oct 10, 2006 18:34 
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I've only driven in an area with specs once in recent history where exceeding the limit was possible, and I was in my GF's MX5. It was a very uncomfortable experience, I don't think I've ever felt so tense while driving.

My newish Clio's got a speed limiter, which I will finally use next time I drive through a specs area.


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PostPosted: Tue Oct 10, 2006 19:06 
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Time they intoduced "specs control" a gps baised cruise control that displayes your average speed from when you push the specs buton.

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PostPosted: Tue Oct 10, 2006 19:09 
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anton wrote:
Time they intoduced "specs control" a gps baised cruise control that displayes your average speed from when you push the specs buton.

So you know immediately if you need to perform even more dangerous tailgating to obfuscate the plate as you go past subsequent cameras. :evil:


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PostPosted: Tue Oct 10, 2006 20:04 
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anton wrote:
Time they intoduced "specs control" a gps baised cruise control that displayes your average speed from when you push the specs buton.

Most trip computers will do that if you reset the average speed display as you pass the first camera.

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 Post subject:
PostPosted: Tue Oct 10, 2006 20:56 
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PeterE wrote:
anton wrote:
Time they intoduced "specs control" a gps baised cruise control that displayes your average speed from when you push the specs buton.

Most trip computers will do that if you reset the average speed display as you pass the first camera.


But it's no help. In fact no average speed readout can help unless you know the exact pair of points used to average - and since we really don't know those, it ain't gong to work.

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 Post subject:
PostPosted: Tue Oct 10, 2006 21:11 
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SafeSpeed wrote:
PeterE wrote:
anton wrote:
Time they intoduced "specs control" a gps baised cruise control that displayes your average speed from when you push the specs buton.

Most trip computers will do that if you reset the average speed display as you pass the first camera.


But it's no help. In fact no average speed readout can help unless you know the exact pair of points used to average - and since we really don't know those, it ain't gong to work.

I think the idea is that you reset your ave. spd readout as you pass the first camera in the set, from which moment you have an exact reading of your average "so far" and can adjust your speed gradually, should the reading vary away from the value desired.

I use cruise control religiously now at SPECS installations, indeed now I've had it once it's very, very high up my list of attributes required in future cars.

As others have said, it does lead to other distinct problems though. Firstly in traffic you tend to end up tailgating people when it inches you closer than you would like to someone who is going almost exactly the same speed as yourself. Obviously there comes a point when you disengage it to avoid getting too close, but I find that with the best will in the world this point is invariably closer than the distance you would maintain without c/c. The second is that you tend to be at higher risk of side-swipes when the cruise control takes you past a vehicle in another lane at a fractionally different speed. Again you can always override this but in practice you do tend to spend longer alongside other vehicles than you would do "normally".

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PostPosted: Tue Oct 10, 2006 21:26 
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An interesting and different case is the A616 Stocksbridge Bypass in South Yorkshire, which is a single-carriageway NSL road with an alternating 2+1 lanes layout, controlled by SPECS.

I am fairly certain that along here the speed is measured between specific pairs of cameras, with "gaps" between them - obviously, for example, there is no point in measuring average speed over a section that contains a roundabout.

A lot of drivers seem to settle down to a speed around 57-58 mph indicated, which obviously tempts you to pass them on the two-lane sections. But you don't really feel comfortable doing more than say around 66-67 mph indicated because otherwise you might be pushing your average for the section. So you end up doing overtakes much more slowly than you would in the absence of the cameras, and if there's a long line of overtaking traffic there's a risk you might run into trouble where the 2+1 sections switch over.

Image

Image

Apparently accidents have reduced since the SPECS cameras were installed, but as there were changes to lining and marking at the same time it is impossible to separate out the effect.

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 Post subject:
PostPosted: Tue Oct 10, 2006 23:54 
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PeterE wrote:
Apparently accidents have reduced since the SPECS cameras were installed, but as there were changes to lining and marking at the same time it is impossible to separate out the effect.


I'm sure the local pratnership will manage it. :roll:


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PostPosted: Wed Oct 11, 2006 00:47 
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Is it me or is the SPECS camera to the right setup up for rear capture?


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PostPosted: Wed Oct 11, 2006 02:20 
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smeggy wrote:
Is it me or is the SPECS camera to the right setup up for rear capture?

Nah it's shadows. Well that's what it looks like to me. :)

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PostPosted: Thu Oct 12, 2006 08:43 
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Ziltro wrote:
smeggy wrote:
Is it me or is the SPECS camera to the right setup up for rear capture?

Nah it's shadows. Well that's what it looks like to me. :)

I know the road well, all the cameras are set up for front capture, as you would expect.


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PostPosted: Thu Oct 12, 2006 11:08 
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Einion Yrth wrote:
Ziltro wrote:
smeggy wrote:
Is it me or is the SPECS camera to the right setup up for rear capture?

Nah it's shadows. Well that's what it looks like to me. :)

I know the road well, all the cameras are set up for front capture, as you would expect.


presumeably (and given the road markings) at that points its SC.. so one is pointing toward us and the other away.


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 Post subject:
PostPosted: Thu Oct 12, 2006 11:20 
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ed_m wrote:
Einion Yrth wrote:
Ziltro wrote:
smeggy wrote:
Is it me or is the SPECS camera to the right setup up for rear capture?

Nah it's shadows. Well that's what it looks like to me. :)

I know the road well, all the cameras are set up for front capture, as you would expect.


presumeably (and given the road markings) at that points its SC.. so one is pointing toward us and the other away.

It's all single carriageway - it's just that some bits have crawler lanes.


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PostPosted: Thu Oct 12, 2006 17:39 
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ed_m wrote:
presumeably (and given the road markings) at that points its SC..

And the camera signs facing both directions... :wink:

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