There is science and engineering, then there is a practical usage. We are not there yet.
Engineers think they can build anything anywhere because it is doable. But is it feasible.
I hope you're not thinking I'm a supporter!
I have - for a very long time, and at increasingly higher levels - worked at giant concerns that have a mixture of marketeers, engineers and scientists.
With scientists, we'd have to instill some idea of practicality. They'd be off thinking of stuff that really couldn't be built, nor would there be a market.
With hard core engineers, the main thing we'd have to say - and this was very very common - was "just because you can, doesn't mean you should."
Marketeers would have ideas that might get the marketplace excited, if they were doable. Usually not doable though.
Turns out, the intersection of the venn diagram between these three groups (not to mention all of the other groups at play) is pretty small.
From what I can see of this couple, the guy is an engineer and he hasn't thought of the practical reasons why this isn't going to work.
No one had the opportunity to show him all of the problems associated with the project - they look like they work in isolation. No input, either that or they only listen to the happy bits and ignore the ugly bits.
I figure they convinced themselves they had something, ignored any negative feedback, got a couple of really tiny government grants ($1000 or so) and they're off and spinning. It's not anything I haven't seen before, but usually it's behind closed doors when someone shows them of the errors of their ways. This time it's public, and it turns out the public can be pretty gullible.
Sad, really.
TL;DR: The solar roadway king has no clothes.