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Title:

LATERAL CLEARANCE TO VISION OBSTACLES ON HORIZONTAL CURVES

Accession Number:

00616586

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/030905110X

Abstract:

Evaluation of the sight distance adequacy on highway horizontal curves with single or multiple obstacles requires determination of the minimum sight distance on the curve. The current method of establishing such a minimum is to plot the sight distance profile for the given curve and obstacle. Approximate relationships have been developed for establishing the sight distance profile. However, there is no explicit, exact solution available for determining the minimum sight distance on the curve. Exact formulas have been derived to relate the available sight distance to the circular curve parameters, lateral clearance of the obstacle, its location along the curve, and the locations of observer and object. These relationships are then used to derive closed-form solutions of the minimum sight distance. To facilitate practical use, values of the minimum sight distance are established for typical ranges of the curve parameters, lateral clearance, and obstacle location. Values of the maximum lateral clearance, which is required in design, are also provided. The methodology and results should be valuable in the operational and cost-effectiveness analysis of highway locations with restricted sight distances.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1303, Geometric Design Considerations 1991. 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

Monograph Accession #:

01407113

Authors:

Easa, Said M

Pagination:

p. 22-32

Publication Date:

1991

Serial:

Transportation Research Record

Issue Number: 1303
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

030905110X

Features:

Appendices (2) ; Figures (8) ; References (16) ; Tables (2)

Old TRIS Terms:

Subject Areas:

Design; Highways; I20: Design and Planning of Transport Infrastructure

Files:

TRIS, TRB, ATRI

Created Date:

Nov 30 1991 12:00AM

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