00219873

Component

http://onlinepubs.trb.org...s/hrr/1967/179/179-002.pdf

VARIOUS COMBINATIONS OF BLACK AND WHITE LETTERS AND BACKGROUNDS WERE NIGHT-TESTED IN THE FIELD, USING AN INTERNALLY ILLUMINATED SIGN, TO COLLECT DATA ON THE RELATIONSHIP BETWEEN SIGN LUMINANCE AND LEGIBILITY OVER A WIDE RANGE OF AMBIENT LIGHTING CONDITIONS. OBSERVERS IN THREE AGE GROUPS WERE PRETESTED FOR VISUAL ACUITY AND DAYLIGHT SIGN LEGIBILITY BEFORE THE NIGHT TESTS. CONTRAST LEVEL AND DIRECTION WERE CONTROLLED, AND THE SIGN LEGEND AND BACKGROUND LUMINANCE WERE MONITORED PHOTOMETRICALLY. MINIMUM AND OPTIMUM BRIGHTNESS VALUES OVER A SIGN FACE ARE SUGGESTED FOR TYPICAL RURAL, SUBURBAN, AND URBAN AMBIENT ILLUMINATION CONDITIONS.

Paper sponsored by Committee on Night Visibility and presented at the 46th Annual Meeting. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

01486560

HS-000 708

pp 16-37

1967

Highway Research Record

Digital/other

Figures (15) ; References (20)

Brightness; Data collection; Design; Field tests; Illuminated traffic signs; Legibility; Lighting; Night visibility; Optimization; Traffic signs

Design; Highways; Safety and Human Factors

TRIS, TRB

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