Interesting story on solar roadways being explored for Australia. Not sure on the viability of this, but it's definitely novel. Here's an excerpt:
The nation's gridlocked roads might not seem the obvious place to build mini-power plants but the France-based Colas group has different ideas.
According to the global supplier of bitumen and other surface materials, the world's millions of kilometres of roads are empty for as much as 90 per cent of each day, providing a big opportunity to generate solar-powered electricity.