MEDIAN VISIBILITY IMPROVEMENTS: NEEDS, METHODS, AND TRENDS
IN ORDER TO PROVIDE OPTIMUM TRAFFIC GUIDANCE, THE MEDIAN ON THE DIVIDED HIGHWAY MUST REMAIN IN DEFINITE CONTRAST WITH THROUGH TRAFFIC LANES TO WARN DRIVERS OF ITS PRESENCE AND TO DELINEATE ITS PERSPECTIVE OF GEOMETRIC CHANGE AT ALL TIMES. TRAFFIC ACCIDENT STUDIES, HOWEVER, INDICATE THAT THERE IS INADEQUATE VISIBILITY OF GENERAL MEDIAN LOCATIONS, ESPECIALLY DURING THE HOURS OF DARKNESS. ALTHOUGH A VARIETY OF TECHNIQUES HAS BEEN DEVELOPED TO INCREASE MEDIAN VISIBILITY, NO UNIFORM SPECIFICATION HAS BEEN ADOPTED THROUGHOUT THE NATION. IT WAS THE INTENT OF THIS STUDY TO ASSEMBLE AND DISCUSS VARIOUS POSSIBLE MEANS OF INCREASING MEDIAN VISIBILITY THROUGH APPLICATION OF TRAFFIC CONTROL DEVICES. A TWO-PART STUDY WAS UNDERTAKEN; FIRST, AN INTENSIVE REVIEW OF PUBLISHED SOURCES WAS MADE TO GAIN A THOROUGH KNOWLEDGE OF THE HISTORICAL DEVELOPMENT MEDIAN VISIBILITY CONSIDERATIONS, AND SECOND, A NATIONAL QUESTIONNAIRE SURVEY WAS CONDUCTED TO GAIN AN AWARENESS OF CURRENT PRACTICES AND ANY INNOVATIONS FOR EFFECTIVE MEDIAN DELINEATION. AS A RESULT OF INTENSIVE INVESTIGATIONS CONCERNING VARIOUS ASPECTS OF THIS SUBJECT, SUGGESTIONS FOR MEDIAN VISIBILITY IMPROVEMENTS ARE PRESENTED BASED ON CURRENT AVAILABLE DATA. /AUTHOR/
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Supplemental Notes:
- Sponsored by Committee on Traffic Control Devices. 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
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Authors:
- Yu, Jason C
- Publication Date: 1971
Media Info
- Media Type: Print
- Features: Figures; References;
- Pagination: pp 92-101
- Monograph Title: Traffic control and driver information
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Serial:
- Highway Research Record
- Issue Number: 366
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Benefit cost analysis; Glare; Headlamps; Highway delineators; Medians; Night visibility; Questionnaires; Reflectorized materials; Road markings; Screenings; Traffic control devices; Traffic signs; Visibility
- Old TRIS Terms: Delineators (Traffic); Traffic marking
- Subject Areas: Highways; Operations and Traffic Management;
Filing Info
- Accession Number: 00226191
- Record Type: Publication
- ISBN: 0309019818
- Report/Paper Numbers: HS-011 999
- Files: TRIS, TRB
- Created Date: Mar 20 1972 12:00AM