The Promise of Solar Roadways?

The TED talk below covers the promise of Solar Roadways. But does this technology hold the promising future that the inventor and backers are promoting? For sure the benefits of a clean energy source from a huge area available around the world ( namely all roads) that could be used to power the vehicles itself as well as homes and businesses is compelling. Including in the road panels a sensing system to detect animals and obstructions on the road would also be a great safety feature. Add some LED lighting and the new roadway panels seem like the greatest think since sliced bread. Right?