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Title:

OPERATIONAL EFFECTS OF DRIVEWAY WIDTH AND CURB RETURN RADIUS

Accession Number:

00348071

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309032601

Abstract:

Existing driveway standards include independent design controls for throat width and curb return radius. They fail to recognize that these two driveway features may have an aggregate effect on driveway operation. In addition, current standards for driveway width and curb return radius are based primarily on vehicle turning capabilities and do not consider how drivers respond, in terms of speed and path, to various driveway designs. The results of proving-ground studies conducted to evaluate the effects of driveway width, curb return radius, and offset taper approach treatments on the speed and path of drivers entering and leaving driveways are presented. A total of 59 nonprofessional drivers participated in the studies. These motorists, driving an instrumented study vehicle, collectively performed more than 1400 driveway entry and exit maneuvers. Speed and path data were collected for each maneuver and were analyzed to determine the relative performance of 19 driveway design conditions. The studies revealed that current standards for driveway width and radius result in driveway designs that encourage very slow entry speeds and, in many cases, undesirable vehicle paths. Recommendations are presented, based on the study results, for driveway width and radii requirements. The studies also found that offset taper approach treatments do not have a significant effect on entry paths or speeds at driveways. (Author)

Supplemental Notes:

This paper appeared in Transportation Research Record No. 819, Operational Effects of Geometrics and Improvement Evaluations. 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 #:

01414338

Authors:

Richards, Stephen H

Pagination:

pp 22-30

Publication Date:

1981

Serial:

Transportation Research Record

Issue Number: 819
Publisher: Transportation Research Board
ISSN: 0361-1981

Conference:

60th Annual Meeting of the Transportation Research Board

Location: Washington District of Columbia, United States
Date: 1981-1-12 to 1981-1-16

ISBN:

0309032601

Media Type:

Print

Features:

Figures (14) ; References (5) ; Tables (1)

Uncontrolled Terms:

Driver reaction

Subject Areas:

Design; Highways; Operations and Traffic Management; I73: Traffic Control

Files:

TRIS, TRB

Created Date:

Mar 30 1982 12:00AM

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