Solar panels in the roadway are dumb, for a variety of reasons.
1) You're gonna get at least twice as much energy by putting the solar panels on poles in the median, or on a roof due to angle and thinner glass.
2) You will get a lot of sunlight lost due to vehicle shadows, debris on the road, skid marks and general scuffing, beyond the halving above.
3) There is a LOT of lower hanging fruit. Use solar panels as patio/driveway/parking lot shades. Mount them on roofs. Et cetera.
4) Cost is astronomical. Even when they hit scale efficiencies, these puppies are set in some deep concrete footings. Cost is going to be HUGE compared to a conventional asphalt/hot mix road. Orders of magnitude more.
5) The inventors have no idea how the grid works, as evidenced by their "virtual storage" handwaving.
6) How exactly are panels covered with snow going to generate the heat to melt the snow? Black asphalt roads will work better for this purpose anyway, due to better absorption.
7) Even if "virtual storage" weren't a fantasy, the calculations on energy production versus energy use due to all the doo-dads (lighting, heat) looks pretty poor.