REPORT OF COMMITTEE ON SIGHT DISTANCES; NEEDED RESEARCH FOR THE DETERMINATION OF SIGHT DISTANCES AT INTESECTIONS
ANY INTERSECTION SHOULD BE SO DESIGNED THAT THE OPERATOR OF AN APPROACHING VEHICLE HAS AN UNOBSTRUCTED VIEW OF BOTH THE WHOLE INTERSECTION AND A LENGTH OF THE INTERSECTING HIGHWAY SUFFICIENT TO PERMIT PROPER CONTROL OF HIS VEHICLE. THIS REQUIRES DETERMINATION OF SIGHT DISTANCES THAT REFLECT THE CHANGE IN TRAFFIC BEHAVIOR AS VEHICLES APPROACH AN INTERSECTION, PARTICULARLY TO ESTABLISH THE HIGHWAY LENGTHS OF THE CORNER AREA THAT MUST REMAIN UNOBSTRUCTED. FACTORS IN DETERMINING SIGHT DISTANCES AT AND NEAR INTERSECTIONS ARE DISCUSSED. SOME FACTORS FOR WHICH RESEARCH IS NEEDED TO DETERMINE VALUES FOR GEOMETRICAL DESIGN OF INTERSECTIONS ARE: PERCEPTION TIME IN DISCERNING VEHICLES ON ROADS INTERSECTING AT VARIOUS ANGLES, PERCEPTION TIME AT A STOP OR SLOW SIGN TO DETERMNE A CLEAR PREFERENCE ROAD, AND THE TIME OR DISTANCE REQUIRED FOR ALL TYPES OF VEHICLES TO START AND ACCELERATE TO VARIOUS SPEEDS OR TO DECELERATE TO SAFE SPEED FROM THE HIGHWAY SPEED. ALL OTHER FACTORS THAT MAY AFFECT OR CONTROL SIGHT DISTANCES ALSO SHOULD BE INVESTIGATED AND EVALUATED. /AUTHOR/
- Record URL:
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Supplemental Notes:
- Vol 18, Pt 1, PP 76-80; part of Report of Department of Design. 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:
- Barnett, J
- Greenshields, B D
- Publication Date: 1939
Media Info
- Media Type: Digital/other
- Monograph Title: Proceedings of the Eighteenth Annual Meeting of the Highway Research Board Held at Washington, D.C. November 28-December 2, 1938. Part I
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Serial:
- Highway Research Board Proceedings
- Volume: 18
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Distance perception; Geometric design; Intersections; Perception; Sight distance
- Uncontrolled Terms: Perception time
- Old TRIS Terms: Perception distance
- Subject Areas: Design; Highways; Safety and Human Factors;
Filing Info
- Accession Number: 00203492
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Jun 1 1971 12:00AM