Actually, the parent's post is not funny at all, considering that graphene based solar technology has reached over 15% efficiency in recent efforts
, and I would bet environmentally friendly solutions will continue to double in efficiency over a given time period. After all, we're chasing the benchmarks established by plants.
As far as roads go, here's an opportunity to leverage a massive area of square footage that is guaranteed to be clear of plants or other obstructions, that would benefit from power and data networking, and if leveraged correctly, can be improved to save many lives.
Why anyone would choose to use this as an opportunity for ridicule is beyond me. Certainly the technology isn't ready yet, but I can see a clear pathway from idea to eventual perfection, given our penchant for achieving economics with scale. The resulting solution might not look anything like the original concept, but the idea of turning our roadways into an intelligent grid, featuring solar power generation, optics, data, and even thermal regulation is brilliant.