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Derek Geldard[_2_] · July 25th 09, 11:02 PM posted to uk.transport,uk.transport.london

On Thu, 16 Jul 2009 17:05:16 +0100, Mike Bristow
wrote:

In article ,
wrote:
Don't bet on it. perhaps it wasn't intentional to start with but when it was
realised it would slow traffic down they probably decided not to fix it.
The lights on the purley way in croydon still go red to let imaginary cars out
of empty shop car parks and industrial estates at 1am. Don't tell me thats
not done on purpose just to slow down traffic who might be trying to get a
move on on an empty dual carraigeway. You're not allowed to get anywhere
quickly in london.

It's probably done on purpose on grounds of cost: lights with a
fixed (or timed) pattern will be cheaper to buy and maintain than
lights with sensors etc.

That, as I understand that would be illegal. Even temp traffic lights
at road works have to have sensors.

Microwave sensors are not expensive in the whole scheme of things when
compared with the cost of digging holes for the lights themselves and
pulling cables.

Derek