If you only read a bit - "over the course of their lifetime" (or words to that effect) was the US Gov condition, in the competition they won...
Secondly, Science and Tech are not possible to judge by today's standards and achievements only, which is what most of the "wise arses" are doing most of the time, when they are trying to "predict" the outcomes of xyz, as I have also warned already, several times.... But why not be a wise arse if you can possibly help it...
Moreover, these would not only be roads and energy collectors... Even if they have to be painted...
Glass as a material was advised to them by most people from Academia... Obviously, not the same glass as the idiots without any achievements behind them are bitching, trying to get themselves noticed... rather desperately...
One more thing: "testing phase" around their house and on two poligons is NOT exactly dangerous, wise arses...
That is the meaning of "testing", so they will NOT be dangerous to drive on... Clever dicks - yeah, they were gonna roll it immediately onto the wider community... Now, why didn't they think of "be cautious"...
It seems they really are stupid!
And even if this only worked in tropics and sub-tropics - I still think it would be of great advantage to all the countries (and hence the world) that could use them... Not much snow there, wasting energy on heating them...
Also, used together with other renewables... Oh, well...
But don't let all this stop you...