I was round that way a few weeks back, on the "new" bit of M1. There's some loops in the road (look a bit like the pressure thingies that operate traffic lights) every so often, and each one has a small white "camera" pointed straight at them from a gantry. It's to the side of the loop though (not in front or behind) so if it snaps your car when you cross the loop, then it could surely only see the roof ?
I've seen similar cameras to the ones you describe on the M69 and M6. (I've only driven twice on that bit of M1 near Leeds so haven't noticed them).
I can only guess that they are Trafficmaster type thingies or perhaps Tax Disc cameras? They might not just see the roof, they might get a good view of your windscreen...
I used to think they were SPECS type speed cameras but they aren't. Unless they don't mind people doing three figure speeds on the M69 ;)
I have travelled at 140mph (indicated) on the M69 (my friend's car, he was driving - no car I've owned so far would do an indicated 140!) and we overtook two other cars who were obviously having a little race :) When we got back down to 70mph it felt so, so slow. That was in a 2 litre Normally Aspirated car by the way! I've experienced an indicated 150mph in the turbo version of the same car on the M1... same nutter driving it.
I've hit an indicated 140 in my 1.8 :) my 2.6 took longer to get there which is wierd, i seen about 142 in the old Audi, and your right, 70mph feels like you have stopped after.
They enable the control centre to automatically detect how fast (or not) the traffic is going whilst the white cameras are CCTV so that control can have a look to see what the problem is.
Take a look at the highways agency website for more info.
i've had an indicated 145mph out of mine on the nice smooth part of the A130 where you can see really far ahead. made sure no bastard was standing close to the roundabout with a speed gun before i nailed it mind :)
the MR2 felt really stable at that speed, the only thing i hated was the ripples in the road! they really slam you up and down at that speed. the suspension coped well though and kept the wheel on the road, i slowed down as a) it got scary seeing cars ahead and b) the roundabout for the A12 wasn't all that far in front anymore :)
toyota recomend a crusing speed of 130mph as this keeps the turbo off boost and avoids it getting to hot.
i've seen vid clips of MR2 turbo's round a track hit an indicated 165mph :)
No no, these aren't the large pole-mounted CCTV cams like you get on the rest of the M1. The little white camera is a lot smaller, and only maybe 3 metres or so from the road-loop it's pointing at - it looks like it only has a very small field-of-vision, basically limited to the roof of each car passing the loop ? They're mounted on the gantry-poles in the central reservation, directly to the side of each loop, pointing down at a 45degree angle.
Except your Turbo only makes boost when the engine is under load, irrespective of your current rpm.
It's perfectly possible to drive along at 5000rpm and remain off boost ! It will infact only come on-boost, if you plant the loud pedal way down.
The 130mph figure will come from the fact that you can probably make enough power to overcome wind-resistance, without making any boost - so the blower isn't doing much.
But it may well require some boost to overcome wind-resistance at 140mph - so it's not a speed you can reach, whilst off-boost.
On the many occasions when either my wastegate actuator became detached or the intercooler blew, the har had loads of torque up to about 2000-2500rpm and would then just die. It was scary on motorway sliproads and was probably slower than my Micra.
When the intercooler blew, the turbo was obviously still spinning, but blowing air straight to atmosphere. Made a fantastic noise like a Tie-fighter! Of course there was no air filtration going into the engine (apart from the intercooler itself!)
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