Citation

Vines J. IMSA J. 2010; 48(3): 46-48.

Copyright

(Copyright © 2010, International Municipal Signal Association)

DOI

unavailable

PMID

unavailable

Abstract

Some of the initial installations of LED traffic signals have been in use now for in excess of 10 years. Due to their longevity, municipalities have many different approaches when it comes to replacement of old signals. These approaches range from those that plan to replace their signals on a rotating basis, with a defined percentage of their signals being replaced every year, to those that still utilize a holdover approach from incandescent bulbs and only replace the LED signal when it goes out. This article discusses the various factors that contribute to a fading LED signal, related to both the signal itself as well as where the signal is installed; the issue of when to replace aging LED traffic signal modules; and the advantages of newer LED traffic signals.