This photo taken on June 6, 2016 shows director of the Eurovia research center, Ivan Drouadaine, displaying, under infrared light, cracks formation into tar, at the Eurovia research center in Merignac, near Bordeaux. Smart roads, stronger, able to light and defrost themselves, generate energy and improving the operation of autonomous cars : major construction companies work hard to give life to these technologies. / AFP PHOTO / MEHDI FEDOUACH / TO GO WITH AFP STORY BY REBECCA FRASQUETMEHDI FEDOUACH/AFP/Getty Images

This photo taken on June 6, 2016 shows director of the Eurovia research center, Ivan Drouadaine, displaying the various kinds of tar developed for smart roads at the Eurovia research center in Merignac, near Bordeaux. Smart roads, stronger, able to light and defrost themselves, generate energy and improving the operation of autonomous cars : major construction companies work hard to give life to these technologies. / AFP PHOTO / MEHDI FEDOUACH / TO GO WITH AFP STORY BY REBECCA FRASQUETMEHDI FEDOUACH/AFP/Getty Images

This photo taken on June 6, 2016 shows director of the Eurovia research center, Ivan Drouadaine, displaying, under infrared light, cracks formation into tar, at the Eurovia research center in Merignac, near Bordeaux. Smart roads, stronger, able to light and defrost themselves, generate energy and improving the operation of autonomous cars : major construction companies work hard to give life to these technologies. / AFP PHOTO / MEHDI FEDOUACH / TO GO WITH AFP STORY BY REBECCA FRASQUETMEHDI FEDOUACH/AFP/Getty Images

This photo taken on June 6, 2016 shows Eurovia project manager, Bertrand Pouteau, displaying the space for a smart road sensor into a piece of tar surface, at the Eurovia research center in Merignac, near Bordeaux. Smart roads, stronger, able to light and defrost themselves, generate energy and improving the operation of autonomous cars : major construction companies work hard to give life to these technologies. / AFP PHOTO / MEHDI FEDOUACH / TO GO WITH AFP STORY BY REBECCA FRASQUETMEHDI FEDOUACH/AFP/Getty Images

This photo taken on June 6, 2016 shows a Eurovia truck testing a road surface equiped with sensors at the Eurovia research center in Merignac, near Bordeaux. Smart roads, stronger, able to light and defrost themselves, generate energy and improving the operation of autonomous cars : major construction companies work hard to give life to these technologies. / AFP PHOTO / MEHDI FEDOUACH / TO GO WITH AFP STORY BY REBECCA FRASQUETMEHDI FEDOUACH/AFP/Getty Images

This photo taken on June 6, 2016 shows a researcher at Eurovia testing a car's wheel onto a tar surface at the Eurovia research center in Merignac, near Bordeaux. Smart roads, stronger, able to light and defrost themselves, generate energy and improving the operation of autonomous cars : major construction companies work hard to give life to these technologies. / AFP PHOTO / MEHDI FEDOUACH / TO GO WITH AFP STORY BY REBECCA FRASQUETMEHDI FEDOUACH/AFP/Getty Images

This photo taken on June 6, 2016 shows a researcher at Eurovia checking the quality of tar at the Eurovia research center in Merignac, near Bordeaux. Smart roads, stronger, able to light and defrost themselves, generate energy and improving the operation of autonomous cars : major construction companies work hard to give life to these technologies. / AFP PHOTO / MEHDI FEDOUACH / TO GO WITH AFP STORY BY REBECCA FRASQUETMEHDI FEDOUACH/AFP/Getty Images

This photo taken on June 6, 2016 shows Eurovia project manager, Bertrand Pouteau displaying road sensors at the Eurovia research center in Merignac, near Bordeaux. Smart roads, stronger, able to light and defrost themselves, generate energy and improving the operation of autonomous cars : major construction companies work hard to give life to these technologies. / AFP PHOTO / MEHDI FEDOUACH / TO GO WITH AFP STORY BY REBECCA FRASQUETMEHDI FEDOUACH/AFP/Getty Images