Four ways to make a solar highway

Last week I mentioned solar roads as a (so far) failed sustainable transport innovation. Specifically, I was talking about projects that have attempted to embed solar panels in the road surface. This is obviously a huge technical challenge, if they’re going to be durable enough to be driven over by heavy traffic. It’s also unnecessary, as there are other ways to make a solar highway.

Solar power along roads can power street lighting and signage, as well as export surplus power to homes and busin...