The Redflex HADECS is a gantry mounted digital speed camera that is being deployed on our motorways where variable speed limits are operated. A single camera is able to monitor up-to five active lanes of traffic including those sections of motorway where a hard shoulder can also be used as a live lane.
Dual radars are used to measure speed and data is transmitted digitally. These rear facing cameras are far more discrete than we are used to, looking more like a CCTV installation than a traditional speed camera.
We've already had reports that these cameras, installed between junctions 5 and 6 on the M25 are now flashing away and capturing hundreds of motorists unaware.

Taken from pocketgpsworld.com
Be careful out there peeps. One camera can cover up to five lanes so I'd expect them to rollout out quickly as they are much more cost effective! Not declared or painted yellow either...

From what i read elsewhere they will be on all the variable limits around Birmingham too.
