Discussion
OK, crawled past the one just after the Thames this morning. There are two sets of sensors planted in the road, linked to a deep green coloured box the size of a boiler with a big long stalk on top (antenna I assume).
To me, this setup looks like another type of traffic flow measuring device. There is no gantry close by to hold a camera or sign of any Truvelo mountings. I think the sensors probably relay info about the traffic flow much like the Trafficmaster system so that the fuzz know what message to put on the gantrys.
Just thought ... maybe the gantrys will say things like "Blue Vectra reg slow down!" 
To me, this setup looks like another type of traffic flow measuring device. There is no gantry close by to hold a camera or sign of any Truvelo mountings. I think the sensors probably relay info about the traffic flow much like the Trafficmaster system so that the fuzz know what message to put on the gantrys.
Just thought ... maybe the gantrys will say things like "Blue Vectra reg

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