Honda is in development of technology they hope will help stop traffic before it even starts. While still in the early stages of development they hope to one day bring the technology to market. Honda plans on doing real time testing in Italy and Indonesia.
Further reading:
http://www.wired.com/autopia/2012/04/honda-congestion-coach/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+wired%2Findex+%28Wired%3A+Index+3+%28Top+Stories+2%29%29&utm_content=Google+Feedfetcher
Further reading:
http://www.wired.com/autopia/2012/04/honda-congestion-coach/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+wired%2Findex+%28Wired%3A+Index+3+%28Top+Stories+2%29%29&utm_content=Google+Feedfetcher