Institute of Transportation Engineers. Vehicle Traffic Control Signal Heads: A Standard of the Institute of Transportation Engineers. ITE, Washington, DC, 1985.
2.
Institute of Transportation Engineers. Vehicle Traffic Control Signal Heads - Part 2: Light Emitting Diode Traffic Control Signal Modules.ITE, Washington, DC, 1998.
3.
BulloughJ. D., BoyceP. R., BiermanA., ConwayK. M., HuangK., O'RourkeC. P., HunterC. M. and NakataA.. Response to simulated traffic signals using light-emitting diode and incandescent sources. Transportation Research Record 1724. TRB, Washington, DC, 2000.
4.
BulloughJ. D., BoyceP. R., BiermanA., HunterC. M., ConwayK. M., NakataA. and FigueiroM. G.. Traffic signal luminance and visual discomfort at night. 80th Annual Transportation Research Board Meeting. TRB, Washington, DC, 2001.
