00219551

Component

http://onlinepubs.trb.org...ubs/hrr/1965/70/70-009.pdf

PRESENT STANDARDS FOR DIRECTIONAL SIGNS ON INTERSTATE HIGHWAYS CALL FOR WHITE LEGEND ON A GREEN BACKGROUND. WHERE THE SIGN IS NOT SELF-ILLUMINATED THE STANDARDS REQUIRE THAT THE LEGEND BE REFLECTORIZED, HOWEVER, FOR ROADSIDE SIGNS AND ILLUMINATED OVERHEAD SIGNS, REFLECTORIZATION OF THE BACKGROUND IS OPTIONAL. THERE HAS BEEN SOME QUESTION AS TO THE DEGREE OF BACKGROUND BRIGHTNESS THAT IS NECESSARY AND CONSEQUENTLY THE DEGREE OF REFLECTORIZATION. THE RESULTS OF PREVIOUS STUDIES BY THE U. S. BUREAU OF PUBLIC ROADS HAVE INDICATED LITTLE PRACTICAL DIFFERENCE IN LEGIBILITY OF SIGNS WITH DIFFERENT DEGREES OF BACKGROUND REFLECTORIZATION, INCLUDING NO REFLECTORIZATION. IT IS POSSIBLE HOWEVER, THAT THE DEGREE OF BACKGROUND BRIGHTNESS AFFECTS OTHER SIGN- EFFECTIVENESS FACTORS SUCH AS DETECTABILITY OR READING TIME. AS AN INITIAL ATTACK ON THIS QUESTION, SIGNS WITH DIFFERENT DEGREES OF BACKGROUND REFLECTORIZATION WERE COMPARED BY ANALYZING THEIR EFFECT ON THE ABILITY OF DRIVERS TO FOLLOW A TEST ROUTE TO A GIVEN DESTINATION ON CONTROLLED-ACCESS HIGHWAYS IN A SUBURBAN AREA. /AUTHOR/

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01055083

pp 74-86

1965

Highway Research Record

Print

Figures (10) ; References (2) ; Tables (4)

Alternatives analysis; Analysis; Brightness; Direction signs; Driver performance; Drivers; Field tests; Illuminated traffic signs; Legibility; Overhead traffic signs; Personnel performance; Reflectorized materials; Roadside; Signs; Studies; Traffic signs

Highways; Safety and Human Factors

TRIS, TRB

Mar 22 1994 12:00AM

• A STUDY OF DEW AND FROST FORMATION ON RETRO-REFLECTORS
• HEADLIGHT GLARE AND MEDIAN WIDTH
• More Light on the Headlighting Problem
• NIGHT VISIBILITY FOR OPPOSING DRIVERS WITH HIGH AND LOW HEADLIGHT BEAMS
• RECOVERY OF FOVEAL DARK ADAPTATION
• THE EFFECT OF GLARE IN SIMULATED NIGHT DRIVING
• TRAFFIC SIGN REQUIREMENTS. PART 1. REVIEW OF FACTORS INVOLVED, PREVIOUS STUDIES AND NEEDED RESEARCH
• VISION AT LEVELS OF NIGHT ROAD ILLUMINATION PART X. LITERATURE 1964
• VISION AT LEVELS OF NIGHT ROAD ILLUMINATION. PART IX LITERATURE 1963