The ultimate way to do this would be to make the tiles out of synthetic diamond. Since diamond can be a semiconductor, you could also use it for the photocell and LEDS so you can build everything out of carbon. Alternatively, Rubrene (an organic crystal composed of carbon and hydrogen) can be used to make excellent LEDS and Solar Panels - in theory.
Diamond is also a better heat conductor then metal so it is perfect for melting snow using energy stored in ultra-capacitors made from diamond-graphene layers in the lower half of the panels.
The Indiegogo plan would be this. Energy from the Solar roadway is fed into a box that removes CO2 and Water from the air and uses extracted Carbon and Hydrogen to make the panels. So once the process starts, it just keeps accelerating as more roadway solar power is available. The production of Solar roadway panels ends up being free and it solves global warming! The only by-product is oxygen.
Energy from the solar roadway can also be used to incinerate waste/damaged panels back into CO2 and water so there is no waste at all.
The major problem I can see would be the creation of really good 3D graphics for the crowd-sourcing campaign.