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The National Academies

NCHRP 20-07/Task 246 [Completed]

Replacement Process for LED (Light Emitting Diode) Traffic Signals
[ NCHRP 20-07 (Research for AASHTO Standing Committee on Highways) ]

  Project Data
Funds: $75,000
Research Agency: Rensselaer Polytechnic Institute
Principal Investigator: John Bullough
Effective Date: 6/16/2008
Completion Date: 8/15/2009
Comments: Published

OBJECTIVE

As an initial step in developing maintenance guidelines for LED traffic signals, this project developed a process for determining when LED traffic signal heads should be replaced. 

STATUS

The report has been published as NCHRP Web-Only Document 146:  Replacement Processes for Light Emitting Diode (LED) Traffic Signals. 

TASKS

Task 1.  Synthesize existing human factors research relevant to the visibility of traffic signals, updating it as appropriate for LED performance.  Describe further research that could be beneficial to the industry.  Submit a task paper within 3 months of the contract start.

Task 2.  Perform studies to correlate field measurement of traffic signal visibility to laboratory measurement.

Task 3.  Describe failure modes for LED traffic signals, their impacts on the visibility of a signal head, and their impacts on test procedures.

Task 4.  Develop a process for determining when LED traffic signal heads should be replaced.  It should be sensitive to local geographic and weather conditions.

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