What's the "lampshade thing on a pole" that's attached to the traffic signal on Broad and West Main?

What's the "lampshade thing on a pole" that's attached to the traffic signal on Broad and West Main? | traffic signal, Broad at West Main, lampshade gadget, Ram Balachandran, WGNS

Have you seen the unusual looking pole attached to the traffic light at the intersection of Broad and West Main? It looks like an old lampshade. 

Murfreesboro Traffic Engineer Ram Balachandran told WGNS News, "This is a camera that detects the presence of vehicles coming to a traffic signal. The old underground loops did not always detect lighter vehicles like motorcycles and scooters. This one is actually a camera with a fisheye lense that see vehicles approaching from any direction."

He noted that this is being tested by the city, and it was installed on Tuesday (8/27/2013). 

He also noted that non-intrusive detectors are also being tested in other heavy traffic areas of the city. 

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