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 optimum tilt angle, it's going to produce less power and it's going to be more prone to shading, which is a problem as shade over just 5 percent of the surface of a panel can reduce power generation by 50 percent.

The panels are also likely to be covered by dirt and dust, and would need far thicker glass than conventional panels to withstand the weight of traffic, which will further limit the light they absorb.

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