Have you ever stopped to consider just how many traffic signals there must be in the world? I have no idea, but I know it has got to be a huge number. You are probably aware that CFL light bulbs, those funky twisty ones, use less energy than incandescent bulbs; you may also know that LED's, or light emitting diodes, are even better. Best of all, they last a very long time, meaning that fewer would need to be manufactured in the first place. Perhaps that's why they are not as well marketed, huh? Anyway, Taiwan is taking down all of the normal old traffic lights and replacing them with LED units. They are expecting to use 85 percent less power once the remaining 420,000 lights are replaced. According to our source article, 350,000 have already been taken care of.
Read through the comments at Engadget here. It seems that many areas have already taken steps to replace their bulbs with LEDs when they burn out. I have seen a few of them around Toledo where I live, but there are still the older type here and there. How about where you live?