Rather than install separate poles for traffic lights, why not put them on existing ones and/or trees? That’s the idea behind this clever design by Gisung Han, Hwanju Jeon and Jaemin Lee. Basically, it "comes in two parts: a flexible LED belt that wraps around street furniture and a solar lid which protects it, shades it and powers it."
Imagine using a flexible LED solar panel as traffic signal! The idea is awesome. It can be installed on any existing circular base like a tree or a utility pole. So there you have a tree that’s a prime spot for a pedestrian signal, and here is this flexi strip waiting to be coiled around the tree! Easy urban and rural installation. 
Concept future – traffic light
Sand Glass
design of the Tree bench
beautiful nature
February 7th, 2011 at 12:14 am
Anyone else see the irony in attaching a solar panel to the trunk of a tree underneath all of the foliage? Also it appears as though the walk/stop signals are active the entire way around the tree. At most intersections only one direction is allowed to walk at a time, this sign would be signaling both directions to walk at the same time, which would not be very good for the pedestrians. But otherwise I love the idea.