Which is one of the main reasons why "solar freekn roads" is such an obviously stupid idea.   


The current roads are insanely cheap, they work very effectively, are simple to install, and are incredibly and easily recycled. The solar roads people proposed a product that was astronomically more expensive, complicated, inefficient at generating power, introduced huge engineering issues, would require constant expensive maintenance and required materials that don't currently exist (a clear road surface that remains clear over time and and provides traction) and couldn't actually do the things it proposed (like show programmable marking on the road) among other issues. And these solar roads people generated millions of dollars on marketing that took off with a huge "grass roots" support.