On Fri, 20 May 2011 17:13:15 +0100, Pip <(E-Mail Removed)> wrote:
>In article <4dd66482$0$2538$(E-Mail Removed)>, Hog. says...
>>
>> http://www.telegraph.co.uk/motoring/...-speeders.html
>>
>> how fast do I have to be travelling to trigger the sensor but still make the
>> lights at green
)
>
>They got some bright lad in to the traffic light department in
>Sunderland in the late Seventies.
Linked traffic signal systems predate the late 70's and prelocate to
places of far more world significance than Sunderland. FFS I was working
on computer linked versions in the west end of london before that time.
>He set the system up so you could get
>successive green lights right through the town centre and out the otehr
>side - if you hit them right.
For a long one Marylebone road was a very well designed one. 27-29 got
you all the way from one end to the other without a stop. There was
another window at about 60 but it did mean having to be a little
enthusiastic on the throttle and taking liberties with some of the ambers.
That was only going west though, there was no way you could do the journey
without a stop going east.
The Finchley Road one was a nightmare. A very ambitious scheme to have
dynamically changing timings to reflect not just the difference in N/S
flow during the morning and evening rush hours but also to add in a bit of
E/W variation into the mix. A valve analogue computer with some very
detailed circuit diagrams printed on A1 sized paper as supporting
documentation but not a single word regarding function filling 4 boxes at
the bottom of the hill and 2 at every junction it covered was what they
came up with. I eventually got it working which surprised everybody but
couldn't get it to work anywhere near what could be defined as balanced
which didn't surprise me in the ****ing least. Ambitions beyond the
bounds of current technology that one was. Piece of **** these days of
course, you could do the whole thing as an Iphone app.
--
steve auvache