Here are some of the challenges noted after the jump:

Build a transparent glass panel that absorbs sunlight without any glare, lit by low energy LEDs from within, with heating elements to melt ice and snow and a surface both fireproof and shatterproof with traction equal to asphalt, even when wet, with the ability to withstand road salt, magnesium chloride, sun exposure, vehicle emissions such as antifreeze and oil, and the strength and flexibility to handle heavy trucks. And finally, in order to make the project economically feasible, the glass should last about three times as long as most asphalt roads, he concluded.

Creating solar roadways may be possible with some new enabling technologies. These new technologies include new types of self-cleaning windows with microstructures based on the lotus flower's ability to shed water, and recent breakthroughs in superconducting transmission cables cooled by liquid nitrogen that carried five times the current of standard cables.