In my opinion it's a pretty good start to convert old roads or built new roads with this sort of material. As global warming is more of a threat now than ever, stuff like this could be the only way to slow it down. If electricity is generated on the roads, it wouldn't be hard to make electric powered cars that can be recharged by drving on these roads. Reducing the amount of oil we're wasting on driving.
What's your opinion about solar freaking roadways?