Solar panels replaced tarmac on a motorway. Here are the results.

Enlarge / A road to nowhere? (credit: Robert B.D. Brice/Wattway)

Four years ago a viral campaign wooed the world with a promise of fighting climate change and jump-starting the economy by replacing tarmac on the world’s roads with solar panels. The bold idea has undergone some road testing since then. The first results from preliminary studies have recently come out, and they’re a bit underwhelming.

A solar panel lying under a road is at a number of disadvantages. As it’s not at the...

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