"Terry Harper" wrote in message ...
"Nik-thevoice" wrote in message
...
They're not speed cameras on the A14. It's TrafficMaster.....as are
all ANPR units on Blue poles.

Have you actually been along the A14?

The speed cameras referred to are those which face the driver and use
infra-red light. They are totally different from the Trafficmaster cameras,
and from the SPECs cameras which you can find on the M6, for example, in the
Thelwall Viaduct road works.

I haven't been along that road.

But such a system is more useful than simply catching speeders. It is
an easy way to automatically detect traffic congestion.

If a large number of vehicles are taking excessively longer than the
normal time to pass between two points it is a sign that the road is
congested and this would be very useful for traffic information
bulletins.

Such methods could be used on the South-Western section of the M25 to
give proper live updates of the "Queue Ahead" signs and adjusting the
variable speed limits.