sub - So just to carry the idea further you would construct a canopy that would support many tons of accumulated snow? Maybe use some of that "free energy" to melt the snow. But if the snow is covering that panels then no power. OK...so a huge storage system with a secondary feed back to the panels to melt the snow. And, of course, a drainage system to keep the water off the roadway to avoid the hydroplaning you mentioned.
I'm actually starting to enjoy fleshing this plan out. Since we're building the canopy why not run an electric connection along the underside just like the street cars in New Orleans use and then electric vehicles could connect up and run that way. And with all that free energy maybe they could devise a way to deliver $5 cups of Starbucks to you while drilling.
Any other add-ons I've missed?