This is not a new idea but it would be great if it really did work. Sadly most lamposts are designed to crumple if hit by a vehicle (for safety) and are certainly not strong enough to resist the wind load created by even a small turbine mounted near its top. However there may be other stronger structures surrounding the road system that could be better - cell-phone masts, overhead gantries etc.
I think you should do some maths to show what you could generate for what sort of wind loading, then you could find a structure to suit.
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by Mollie Green