  A primary purpose of this review is to identify and summarize recently
published information about the use and performance of light-emitting diode
(LED) traffic signals. It consists of two sections: a synopsis of experiences
of municipalities using LED traffic signals in 1999 and 2000, and a discussion
of technical, economic and market issues surrounding the deployment of LED
signals. This review includes articles and reports published in 1999 and 2000.
