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Title:

SIGHT DISTANCE ON HORIZONTAL ALIGNMENTS WITH CONTINUOUS LATERAL OBSTRUCTIONS

Accession Number:

00714989

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/issn/03611981

Abstract:

For safe and efficient highway operation, sight distance has been of great interest to researchers in the field of highway geometric design. Several formulas have been developed to relate the available sight distance to the horizontal and vertical alignment of the highway and the existing obstructions. Among these formulas is the one presented by AASHTO to determine the available sight distance on a simple horizontal curve with a length greater than the sight distance. For shorter curves in which the sight distance is greater than the curve length, other methods have been developed. However, none of these methods considered the case of continuous lateral obstructions or complicated horizontal alignments. Consequently, it has been recommended that the available sight distance be checked graphically or in the field. For this study, general analytical procedures were developed to check the available sight distance on horizontal alignments with single and continuous obstructions. A horizontal alignment may consist of any combination of horizontal components, such as straight segments, circular curves, and spiral curves. Based on the analytical procedure, a computer software program was developed to establish the no-passing zones on two-lane highways, according to the specifications used by the Ministry of Transportation of Ontario, Canada. The developed procedures and computer software proved to be very accurate. Using them would save time and effort and would avoid possible human errors when the sight distance is checked using current graphical or field techniques. The computer software can also be used to develop design tables and charts for the available sight distance on different horizontal alignments.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1500, Geometric Design, Roadside Safety Features, Roadside Hardware Monitoring, and Scenic Loop Tours. 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 #:

01399820

Language:

English

Authors:

Hassan, Yasser
Easa, Said M
Abd El Halim, A O

Pagination:

p. 31-42

Publication Date:

1995

Serial:

Transportation Research Record

Issue Number: 1500
Publisher: Transportation Research Board
ISSN: 0361-1981

Features:

Figures (8) ; References (12) ; Tables (5)

Old TRIS Terms:

Subject Areas:

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

Files:

TRIS, TRB

Created Date:

Dec 26 1995 12:00AM

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