Here is an interesting proposal?! As commuters expend energy through fuel consumption the energy released by the automobiles will then be harnessed by turbines. The poetics of no energy ever being created, but simply transferred, is satisfyingly embraced in this concept. Not to mention the benefit of a constant visual mantra of the global warming crisis being ever present while driving.
Cool concept. It might make sense if highway signs were incorporated into the mechanism. That way you kill two birds with one stone. By the look of the turbines though there doesn’t appear to be much room to spare.