Enlil was the name of the Mesopotamian god of wind and storms. Now, fittingly, it's what Turkish inventor Gelecegin Yenilenebilir Sehirleri is calling his vertical wind turbine. Interestingly enough, the plan of Sehirleri's company, Deveci Tech, is to line highway medians with them, capturing the wind energy of passing vehicles in order to generate electricity:
In litigation-happy America, of course, this thing would have to be wrapped in a safety cage. I wonder if that would decrease its efficacy.
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I like his thinking. Who amongst us hasn’t been buffeted by a passing large vehicle and felt it’s wind power. Carefully sited these devices have potential. (Voltage potential;)
The additional drag induced by the turbines would more than offset any electricy produced with increased fuel consumption by the vehicles.
Perhaps if the turbines are sited on a downhill section they would harness and assist the braking power of passing vehicles. Less wear and tear on brake pads.
You could probably make a concrete barrier at the bottom that would prevent impact with cars, and have it slanted to channel more air up towards the turbines. As an additional revenue source, you could paint advertisements on the blades. They'd be visible to both sides of the traffic. If no advertisements, there could be important traffic communications like exit number, speed limit, etc.