Agreed. And, I think that we can agree that any power generated (assuming no wind), comes from the passing vehicles, which means that the cars are producing additional power which is greater than the power being produced by the turbines (2nd Law), i.e., this is a bad idea.
My interest is...
Russ,
Your answer is too simplistic. How does the energy actually get transferred? Does the car 'push' a wall of air and the turbine 'push' back on this column? At what speed does the transfer happen - is it the speed of sound? How would you model this interaction?
Consider a wind turbine placed alongside a road in a location with no wind. If a vehicle drives past (without loss of generality, at a constant speed) the turbine will spin and electrical power can be produced. The power produced is obviously supplied by the vehicle. As compared to the case...