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12 REFERENCES 1. "Vehicle Traffic Control Signal Heads: Light Emitting 4. "Equipment and Material Standards of the Institute of Diode (LED) Circular Signal Supplement," Prepared by Transportation Engineers, Chapter 2a, VTCSH Part 2, the Joint Industry and Traffic Engineering Council Com- Light Emitting Diodes (LED) Vehicle Signal Module mittee, Institute of Transportation Engineers, Washington, (Interim)," The Institute of Transportation Engineers, D.C., June 27, 2005. Washington, D.C., Nov. 1998. 2. "Vehicle Traffic Control Signal Heads: Light Emitting 5. Commission Internationale De L'Eclairage (CIE) Publica- Diode (LED) Vehicle Arrow Traffic Signal Supplement," tion 127, "Measurement of LEDs," CIE Central Bureau, Prepared by the LED Committee of the Traffic Engi- Vienna, Austria, 1997 [Online]. Available: http://www. neering Council, Institute of Transportation Engineers, Washington, D.C., July 1, 2007. 3. "The Energy Policy Act of 2005 Title I, Subtitle C, Sec- tion 135 (z)," U.S. Congress, Washington, D.C.