Cameras

On UK m’way bridges I have seen what appear to be small cameras in a blue or green casing. What are they for

They usually seem to be pointing at the middle lane of the motorway from a bridge, sometimes there are two (one above the inside lane and one over the middle lane). There are similar looking ‘cameras’ (if that’s what they are, they don’t look like normal CCTV cameras) at the side of the road on blue posts, usually with two cameras mounted on top. Are they cameras? If so, what are they being used for?
Some people think they are TrafficMaster and some think they are to check tax disk. Anyone know for sure?

They are used by the TrafficMaster system to gauge how busy a rout is. When someone pops their route into a satnav or other similar system that uses traffic master it can tell you the best route based on how well traffic is moving in certain areas, i.e. if the traffic in a location is moving slower than the speed limit it will advise a route that avoids that are if it is quicker to do so.
They are deffinately not cctv and are not used to check the holograms on tax discs.

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