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This metallic sculpture which looks like a Traffic Light Tree is located on a roundabout at the intersection of Heron Quays with Westferry Road near the Canary Wharf, London.
The Eight metres tall art work is creation of French artist Pierre Vivant. Installed in 1998, its 75 lights have a ever changing pattern, which is computer controlled, conveying the restlessness of the Canary Wharf.
It is a popular spot for tourists, though initially it had caused some confusion to the motorists.
Source of info: Wikipedia