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2001
TRAFFIC SIGNAL LUMINANCE AND VISUAL DISCOMFORT AT NIGHT

Transportation Research Record, Issue 1754, p. 42-47

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2000
RESPONSE TO SIMULATED TRAFFIC SIGNALS USING LIGHT-EMITTING DIODE AND INCANDESCENT SOURCES

Transportation Research Record, Issue 1724, p. 39-46

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1997
DAYTIME PHOTOMETRIC REQUIREMENTS FOR PEDESTRIAN SIGNALS

Transportation Research Record, Issue 1605, p. 41-48

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1996-05-17
DEVELOPMENT OF LED LIGHT SOURCE FOR TRAFFIC CONTROL DEVICES

NCHRP-IDEA Program Project Final Report, 9 p.

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1995-04
REQUIREMENTS FOR APPLICATION OF LIGHT EMITTING DIODES (LEDS) TO TRAFFIC CONTROL SIGNALS

NCHRP Research Results Digest, Issue 205, 11 p.

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1992
EVALUATION OF VARIABLE MESSAGE SIGNS: TARGET VALUE, LEGIBILITY, AND VIEWING COMFORT

Transportation Research Record, Issue 1376, p. 35-44

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1991
LEGIBILITY AND CONTRAST REQUIREMENTS OF VARIABLE-MESSAGE SIGNS

Transportation Research Record, Issue 1318, p. 137-141

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