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Title:

STOPPING SIGHT DISTANCE DESIGN FOR LARGE TRUCKS

Accession Number:

00490645

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309048079

Abstract:

Stopping distance requirements for large trucks are compared with current AASHTO stopping sight distance criteria. Key elements affecting stopping sight distance for trucks include perception-reaction time, truck braking distance, and truck driver eye height. The paper stresses the variability of truck driver braking performance and the safety benefits associated with antilock brake systems for trucks. Findings indicate that trucks with conventional brake systems may require stopping sight distances greater than those recommended by current AASHTO policy. The increased values potentially affect all related stopping sight distance design considerations (horizontal and vertical curvature, intersection sight distance, and highway-railroad grade crossings). The magnitude of increase, however, is highly dependent on individual driver brake performance capabilities. For drivers whose emergency braking performance is equivalent to the worst performance observed in braking tests for conventional brake systems, substantially greater stopping sight distance and longer vertical curves would be needed than are used under current AASHTO criteria. Drivers with braking performance equivalent to the best performance observed in braking tests for conventional brake systems require only slightly longer stopping sight distance than current AASHTO criteria and require vertical curve lengths that are shorter than current AASHTO criteria. If antilock brake systems are eventually mandated for trucks, current AASHTO stopping sight distance policy would adequately accommodate the needs of large trucks.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1208, Highway Sight Distance 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

Monograph Accession #:

01414043

Authors:

Harwood, Douglas W
Glauz, William D
Mason Jr, John M

Pagination:

p. 36-46

Publication Date:

1989

Serial:

Transportation Research Record

Issue Number: 1208
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309048079

Features:

Figures (6) ; References (18) ; Tables (7)

Old TRIS Terms:

Subject Areas:

Design; Highways; Motor Carriers; Planning and Forecasting; Safety and Human Factors; I21: Planning of Transport Infrastructure

Files:

TRIS, TRB, ATRI

Created Date:

Jan 31 1990 12:00AM

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