City of Phildelphia: Light emitting diodes for traffic signal displays

Technical Report · Fri Dec 01 04:00:00 EST 1995

DOI:https://doi.org/10.2172/258151· OSTI ID:258151

This project investigated the feasibility of using light emitting diodes (LEDs) for red traffic signals in a demonstration program at 27 signalized intersections in the City of Philadelphia. LED traffic signals have the potential to achieve significant savings over standard incandescent signals in terms of energy usage and costs, signal relamping costs, signal system maintenance costs, tort liability, and environmental impact. Based on successful experience with the demonstration program, the City of Philadelphia is currently developing funding for the conversion of all existing red incandescent traffic signals at approximately 2,700 intersections to LED signals. This program is expected to cost approximately $4.0 million and save about $850,000 annually in energy costs. During late 1993 and early 1994, 212 red LED traffic signals (134 8-inch signals and 78 12-inch signals) were installed at 27 intersections in Philadelphia. The first group of 93 signals were installed at 13 prototypical intersections throughout the City. The remaining group of signals were installed on a contiguous route in West Philadelphia consisting of standard incandescent signals and LED signals interspersed in a random pattern.

• Research Organization: Urban Consortium Energy Task Force, Chicago, IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FC02-92CE16067
• OSTI ID: 258151
• Report Number(s): DOE/CE/16067--9(Rev); ON: DE96012882
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
COLOR
COST
ELECTRICAL EQUIPMENT
ENERGY EFFICIENCY
FAILURES
LIGHT EMITTING DIODES
MAINTENANCE
PENNSYLVANIA
PERFORMANCE
SIGNALS
TRAFFIC CONTROL