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Title:

GEOMETRIC DESIGN FOR ADEQUATE OPERATIONAL PREVIEW OF ROAD AHEAD

Accession Number:

00715001

Record Type:

Component

Availability:

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

Abstract:

Minimum geometric conditions must exist to provide an ample amount of preview sight distance (PVSD) for comfortable and safe traffic operations. The PVSD concept is based on the assumption that the driver views or previews the roadway surface and other cues that lie ahead to obtain the information needed for vehicular control and guidance. The driver needs a minimum PVSD to perceive and respond to upcoming alignment cues; the roadway geometry affects how much PVSD is available for the driver. A roadway designed with geometric features adequate to the design speed would in many cases provide ample PVSD, but a roadway with constrained design features could have inadequate PVSD. The paper includes a derivation of equations to calculate the available preview sight distance on a crest vertical curve and discusses two applications of the PVSD concept to sharp horizontal curves. When a geometric analysis finds that inadequate PVSD exists, upgraded signing or pavement marking to provide drivers with extra positive guidance may be considered as a means of compensating for inadequate PVSD.

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:

Gattis, J L
Duncan, John

Pagination:

p. 139-145

Publication Date:

1995

Serial:

Transportation Research Record

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

Features:

Figures (3) ; References (8) ; Tables (3)

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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