Ruby <[email protected]> wrote:
> Let's be dark at night, so that we may see the stars! > > http://www.darksky.org/ > I am a big fan of this organization. I discussed it in my book. I think these roads might decrease ambient light, because they reduce the need for conventional overhead lights, which are a lot brighter and more concentrated. Overhead lights waste a lot of light when they are pointed up, or not shaded on top. They illuminate the sky and clouds. These roads work entirely on solar energy. I think they are suitable for pedestrian paths, and bicycle paths. I doubt that the surface would survive on vehicle roads. It might be useful for the margin, to mark the edge of the road. I suppose that might add to light pollution. That is now done with reflective markers. I guess that is sufficient for automobile traffic. The light from this material decreases as the night grows darker. That is remarkable. It would help reduce ambient light. - Jed
