00163043

Component

http://onlinepubs.trb.org...s/trr/1976/611/611-006.pdf

https://scholar.google.co...owan&publication_year=1976

The basic objective of this research was the evaluation of high-intensity reflective sheeting for use on overhead sign installations without external illumination. The effects of height above the roadway and angle of sign tilt with respect to the vertical, headlight configuration, and vehicle approach speed to sign legibility distance were measured for both an externally illuminated sign and a high-intensity reflective sheeting sign. It was concluded that the nighttime legibility distance of overhead signs was not appreciably affected by increases in mounting height in the range of 5.5 to 7.0 m (18 to 23 ft), by changes in angle of the sign with respect to the vertical in the range of .5 to +5 deg, or by vehicle approach speed. Headlight configuration, as expected, was the dominant factor in the legibility distance of the unilluminated high-intensity sign, further, the high-intensity sheeting can be used without external illumination for overhead sign installations in spite of the observed difference in legibility distances. The average legibility distances in 19 percent less with low beams and 5 percent more with high beams on the high-intensity sheeting without external illumination than on the standard installation without illumination. /Author/

Publication of this paper sponsored by Committee on Visibility. 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

01410993

HS-021 004

pp 38-44

1976

Transportation Research Record

0309025877

Print

Figures (5) ; References (5) ; Tables (5)

Distance; Headlamps; Height; Highway safety; Legibility; Lighting; Night visibility; Overhead traffic signs; Reflective signs; Sheathing; Traffic signs

Highways; Safety and Human Factors

TRIS, TRB

Oct 13 1977 12:00AM

• COMPARISON OF DRIVER DYNAMICS WITH ACTUAL AND SIMULATED VISUAL DISPLAYS
• DRIVER REACTION TO IMPROVED WARNING DEVICES AT A RURAL GRADE CROSSING (ABRIDGEMENT)
• EFFECT OF ILLUMINATION ON RURAL AT-GRADE INTERSECTION ACCIDENTS (ABRIDGMENT)
• EFFECTIVENESS OF AUTOMATIC WARNING DEVICES IN REDUCING ACCIDENTS AT GRADE CROSSINGS
• EVALUATION OF HIGH-INTENSITY SHEETING FOR OVERHEAD HIGHWAY SIGNS
• INDIRECT FACTORS AFFECTING REFLECTIVE SIGNS BRIGHTNESS (ABRIDGEMENT)
• INVESTIGATION OF ACCIDENT DATA FOR RAILROAD-HIGHWAY GRADE CROSSINGS
• LUMINANCE AND CONTRAST FOR SIGN LEGIBILITY AND COLOR RECOGNITION
• PASSIVE CONTROL AT RAILROAD-HIGHWAY GRADE CROSSINGS (ABRIDGEMENT)
• PREDICTING TARGET-DETECTION DISTANCE WITH HEADLIGHTS
• REVIEW OF NEEDS OF USERS OF RIDE QUALITY TECHNOLOGY (ABRIDGEMENT)