Citation

McNess RW, Jones HD. Transp. Res. Rec. 1987; 1149: 22-31.

Copyright

(Copyright © 1987, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing)

DOI

unavailable

PMID

unavailable

Abstract

In this paper, results of an operational study investigating the legibility distance of unlighted overhead guide signs are presented. Opaque sign backgrounds, as well as engineer, superengineer, and high-intensity reflective sheetings were used in combination with button-removable and high-intensity reflective copy. There was no significant difference between lighted and unlighted signs (lighted, 787.7 ft; unlighted, 788.1 ft) by sign material. Several sign combinations performed better than others. Engineer reflective sheeting was legible at more than 900 ft both on the lighted and on the unlighted routes, whereas engineer reflective sheeting with high-intensity stick-on copy was legible at 775 ft (lighted) and 646 ft (unlighted). The following combinations were visible at more than 800 ft: superengineer/button (863 ft), high-intensity/stick-on (825 ft), and superengineer/stick-on (811 ft).

Record URL:
http://onlinepubs.trb.org/Onlinepubs/trr/1987/1149/1149-005.pdf

TRT Terms: Distance; Freeways; Guide signs; Legibility; Lighting; Materials; Overhead traffic signs; Reflective signs; Traffic signs; Visibility
Uncontrolled Terms: Background (Traffic signs)
Old TRIS Terms: Freeway signs; Traffic sign materials

Language: en

Keywords

HIGHWAY SIGNS, SIGNALS AND MARKINGS; STREET LIGHTING; LIGHT - Reflection; SIGNS - Materials