ANALYSIS OF INFLUENCE OF PERCEPTION-REACTION TIME ON CASE III INTERSECTION SIGHT DISTANCE

For years researchers have attempted to conclusively define values to be used for perception-reaction (PR) times for highway design and operations. Several empirically based studies have confirmed values that are used in different design guides and manuals. However there still appears to be no final agreement on what values should be used for various design purposes. PR time is an essential element in determining intersection sight distance (ISD) requirements. Although there has been much discussion of the appropriate values of PR times that should be used for this purpose, an understanding of the relative influence of PR time on ISD would help to determine whether very exact PR times are needed to adequately design intersections. Previous work on the assessment of appropriate PR times is reviewed, and the influence of varying PR times on the determination of Case III ISD values is analyzed to see whether the designer needs to be concerned about the selection of exact PR times. Several conclusions were reached on the bases of the review and the analyses. It was concluded that although there has been a great deal of research on PR times, there appears to be some doubt about how well the current values used for highway design purposes represent real-world conditions. Also for applications related to Case III ISD determination PR time has little influence on the overall ISD requirement. On the basis of these conclusions it is recommended that the current values used for PR time for Case III ISD applications be retained because of their validation from several empirical studies and the insensitivity in change of ISD values relative to changes in PR times.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/trr/1994/1445/1445-022.pdf
• Record URL:
  https://scholar.google.com/scholar_lookup?title=ANALYSIS+OF+INFLUENCE+OF+PERCEPTION-REACTION+TIME+ON+CASE+III+INTERSECTION+SIGHT+DISTANCE&author=R.+Brydia&author=M.+Pietrucha&publication_year=1994
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• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1445, Cross Section and Alinement Design Issues. 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
• Authors:
  • Brydia, Robert E
  • Pietrucha, Martin T
• Publication Date: 1994

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 189-197
• Monograph Title: Cross section and alinement design issues
• Serial:
  • Transportation Research Record
  • Issue Number: 1445
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Highway design
• Old TRIS Terms: Intersection sight distance; Perception-reaction times
• Subject Areas: Design; Highways; Safety and Human Factors; I20: Design and Planning of Transport Infrastructure; I83: Accidents and the Human Factor;

Filing Info

• Accession Number: 00675346
• Record Type: Publication
• ISBN: 0309060516
• Files: TRIS, TRB, ATRI
• Created Date: Mar 20 1995 12:00AM