M42 Cameras still live
Discussion
Just a reminder to those unfamiliar with the area.
M42/M40 junction to 2 m south of M42 jn 6.
The cameras referred to in the earlier thread www.pistonheads.com/gassing/topic.asp?t=69588&f=10&h=0&hw=M42
are still live and they are catching a humongous number of drivers.
The trigger limit is quite low, about 57/58 it seems.
I go through dead on true 50 (calibrated speedo) and every time see drivers get flashed who are going not that much quicker.
Also vans about, basically if you don't trigger the electronic slow down signs you will be OK, if you do watch out.
Not going to enter into a debate about the roadworks / limit as this was covered in the earlier thread.
M42/M40 junction to 2 m south of M42 jn 6.
The cameras referred to in the earlier thread www.pistonheads.com/gassing/topic.asp?t=69588&f=10&h=0&hw=M42
are still live and they are catching a humongous number of drivers.
The trigger limit is quite low, about 57/58 it seems.
I go through dead on true 50 (calibrated speedo) and every time see drivers get flashed who are going not that much quicker.
Also vans about, basically if you don't trigger the electronic slow down signs you will be OK, if you do watch out.
Not going to enter into a debate about the roadworks / limit as this was covered in the earlier thread.
LexSport said:
Off at a tangent, FiF, how does one get their speedo calibrated? Is it just a case of comparing it with a GPS detector's readout, adjustment on a rolling road, or something else...?
In my case it is done by a series of timed runs at various steady speeds along the official measured miles used by the traffic units based at the local county HQ.
Results wound into Excel and graphed, usually possible to find a best fit curve whic is then the calibration curve, so its possible to estimate what the indicated speed will be at a true 60 say.
Then its a matter of how do you present the info? A scale marked on the speedo? a small conversion table fixed to the sunvisor?
I have an excel file which can do it if you are interested?
FiF
A lot of watches have a dial called a tachymeter on them, this is a scale possibly running down from 500 to 60 clockwise round the watch. If you start something with the seconds hand at the top then when you finish it read from where the seconds hand is to the scale, this is how many per hour you are doing.
So say you want to do a measured mile (Yellow, Yellow Red, Red disks at tha side of a motorway) then start it when the seconds hand is at the top (or start the watch), keep a constant speed according to your speedo and say it takes you 51.5 seconds then the average speed over the mile is 70mph. Same for a Kilometer.
The above description assumes that you have a passenger to do the timing and that you travel at a safe speed and that road conditions do not make driving at a constant speed dangerous or impossible and that I am in no way responsible for anything you do that could be construed as dangerous or illegal.
So say you want to do a measured mile (Yellow, Yellow Red, Red disks at tha side of a motorway) then start it when the seconds hand is at the top (or start the watch), keep a constant speed according to your speedo and say it takes you 51.5 seconds then the average speed over the mile is 70mph. Same for a Kilometer.
The above description assumes that you have a passenger to do the timing and that you travel at a safe speed and that road conditions do not make driving at a constant speed dangerous or impossible and that I am in no way responsible for anything you do that could be construed as dangerous or illegal.
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