Time for a Traffic Signal Upgrade?

The introduction of light emitting diodes (LED) technology in traffic signals has increased the lifespan of bulbs and decreased energy consumption. This combination of reduced maintenance and energy savings has helped maximize return on investment for signal upgrades. However, many of these early LED signals are due to be replaced, and it is important to know when to upgrade or replace a system. Signals that were installed more than seven years ago probably should be replaced, but the decision whether to replace a 5- to 7-year old signal is not an easy one. Some factors affecting this decision include whether older installations are failing more frequently, the liability that will be incurred if an older operation fails, and the advantages of upgrading older LEDs. While LEDs are a more reliable option than incandescent bulbs, they are not fail-proof. And when they fail, they do so slowly, making them less visible which creates a possible hazardous situation. Several factors contribute to their failure; lens degradation, LED degradation, and aging power supplies.


  • English

Media Info

  • Media Type: Print
  • Features: Photos;
  • Pagination: pp 36-37, 41
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01484543
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 17 2013 10:51AM