Solar Roadways is an idea that is still in prototype and testing phases. It would replace highways with durable solar panels that are used from simple materials and would increase safety, reduce materials, and run completely on its own.
I think that this idea is super organized, thought out, and essential for our earth. It is a great solution to the problem of emissions. I think at one point solar cars would be able to run off it too. I know it is not a fully formed idea and not in use yet but I believe in the cause.
Going green and solar power are the biggest things right now. Everyone is trying to advance on this except for big oil and corporations who could lose money. But it is vital that the majority of us try to convert to these systems. Through advances in technology and design there is a lot of potential.