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2006
Determining Colors for Traffic Control Devices at Transponder-Controlled Tollbooth Lanes with a Sign Simulator

Transportation Research Record: Journal of the Transportation Research Board, Issue 1973, pp 48-54

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2003
NIGHTTIME EXPERT PANEL AND PHOTOMETRIC EVALUATIONS OF UNLIGHTED OVERHEAD GUIDE SIGNS (WITH DISCUSSION AND CLOSURE)

Transportation Research Record, Issue 1844, p. 67-78

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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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1987
LEGIBILITY OF FREEWAY GUIDE SIGNS AS DETERMINED BY SIGN MATERIALS

Transportation Research Record, Issue 1149, pp 22-31

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1977
DETERMINE THE LUMINOUS REQUIREMENTS FOR RETROREFLECTIVE HIGHWAY SIGNING

NCHRP Summary of Progress, p. 158-166

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