From the longer Wikipedia page [1]
Traffic Light Tree is a public sculpture in Blackwall, London, England, created by the French sculptor Pierre Vivant following a competition run by the Public Art Commissions Agency for the London Docklands Development Corporation under their Public Art programme. Originally situated on a roundabout in Canary Wharf, at the junction of Heron Quay, Marsh Wall and Westferry Road, it is now located on a different roundabout near Billingsgate Market.