Thunderf00t / Could they make a composite material? Well maybe. Naturally it will cost more. If its fiber reinforced, you sensibly lose the ability the recycle the material. If its going to use rock to make a composite, then its basically indistinguishable from regular blacktop, with the exception it uses polymeric crap as the binder rather than bitumen. Hardly a revolution. People have been adding all sorts of extras to roadsurfaces for years. Most notably ground up waste tires worked quite well.