REQUIREMENTS FOR APPLICATION OF LIGHT EMITTING DIODES (LEDS) TO TRAFFIC CONTROL SIGNALS

The incandescent lamps which are presently used for traffic signals are inefficient compared to other light sources. Maintenance costs are high for these lamps and the light output degrades as the lamp ages. These problems, plus the ever increasing cost of energy, justify considering other light sources. One alternative is light emitting diodes (LEDs). Before existing incandescent lamps are replaced by LEDs, it is necessary to show that LED signals will meet applicable standards for color and intensity, not adversely affect the safety of operations of the roadway, and be economically advantageous. NCHRP Project 5-12 was initiated in response to this need. The objective of the research was to determine the feasibility and implementation potential of LEDs. The project found that red and Portland orange (pedestrian) LED signals are currently feasible.

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 149-156

Subject/Index Terms

Filing Info

  • Accession Number: 00725979
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 16 1996 12:00AM