I believe that you can also get "tiles" that look like cedar shake and possibly ones that have the look of the arcitectural asphalt shingles. It looks like you can get solar shingles tha tlook similar to the asphalt shingles but if the HOA is even specifying the colors that you are allowed to use, they porbably wouldn't pass (the pictures I saw they were significantly shinier than regular shingles)
Yet another reason to avoid neighborhoods with HOA covenants although it's getting harder to find...
@David Ashton: In most of the USA, the predominant roofing materials are shimgles. In my subdivision, that is literally the rule (HOA covenants). Even the color choices are limited to the ones originally offered by the developer. There have been allowances made for some new styles ("architectural" shingles that look a bit like tiles, with a 3D aspect) that were not around 15 years ago when development began. Tiles are mostly a Florida/California thing (Spanish-style barrel tiles). Even there that's mostly for up-scale houses.
@MHRackin....have a look at Crusty's links below, the tiles he links to are really quite good looking - not much different from roof slates. I know these are mostly used in the UK (from Welsh slate quarries) but there is no reason why the more usual roof tiles could not be built tlike this. In Australia a lot of roofs (mine included) use tiles - usually cement ones. A solar cell could be built into them without much trouble, I think?
Sharp used to have solar tiles, which I believe were to be used in place of typical asphalt shingles, rather than placed on top. Those dissappeared from their web site a few years ago. Now they are marketing "SunSnap" panels which have easier installation and integrated/available microinverters (EnPhase). http://www.sharpusa.com/SolarElectricity/SolarForResidential/SunSnap.aspx
I'm surprised nobody has brought up the legal impediments for roof solar. In my area (Atlanta) the building codes and the restrictions in nearly all HOA covenants explicitly forbid solar onstallations on roofs (for various reasons). This may date back to the days when roof solar meant hot water heating (either pool water or domestic ho water supply) when roof loading and leakage risk were the primary reason. The other mtoivation is esthetic, as a lot of the older technologies were fairly ugly!
Roof tiles would make a lot more sense. I think it's pretty easy to see that very little about the system makes any sense at all.
Even if the technology and economics were close to what would be viable, roof panels would still make a lot more sense. On a roof, you don't need to worrry about the surface neededing to hold weight, nor do you need to worry about the surface requiring traction.
I'm curious what the $1M goal of the Kickstarter campaign was -- maybe just proposal writing? Clearly that isn't going to get you very far if actual solar panels are to be installed on a piece of roadway -- even a rather small piece of roadway.