TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 387: LED Traffic Signal Monitoring, Maintenance, and Replacement Issues explores the maintenance and replacement of light-emitting diode (LED) traffic signal modules.
National Academies of Sciences, Engineering, and Medicine. 2008. LED Traffic Signal Monitoring, Maintenance, and Replacement Issues. Washington, DC: The National Academies Press. https://doi.org/10.17226/14202.
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