TRID
Text Size:

Title:

DESIGN CONSIDERATIONS FOR HIGHWAY REVERSE CURVES

Accession Number:

00675325

Record Type:

Component

Availability:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 USA
Order URL: http://www.trb.org/Publications/Pages/262.aspx

Find a library where document is available

Order URL: http://worldcat.org/isbn/0309060516

Abstract:

Existing sight distance models of highway horizontal (vertical) curves are applicable only to simple circular (parabolic) curves. These simple models may greatly overestimate the lateral clearance needs for reverse horizontal curves and the curve length requirements for reverse vertical curves. No available analytical model quantifies the effects of the alignment reversal on sight distance characteristics. The geometric and sight distance characteristics of reverse horizontal and vertical curves are presented. For reverse horizontal curves the available sight distance is related to the parameters of the two circular arcs, the length of the common tangent, the locations of the driver and object, and the location of the vision-limiting obstacle. The obstacle may be located within the circular arcs or the common tangent. For reverse vertical curves the available sight distance is related to the parameters of the crest and sag arcs, the length of the common tangent, the locations of the driver and object, and their heights. The sight-hidden zone (dip) that may exist on a reverse horizontal (vertical) curve is examined. The sight distance profiles and minimum sight distances of reverse and simple curves are compared.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1445, Cross Section and Alinement Design Issues.

Monograph Accession #:

01401257

Language:

English

Authors:

Easa, Said M

Pagination:

p. 1-11

Publication Date:

1994

Serial:

Transportation Research Record

Issue Number: 1445
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309060516

Features:

Figures (9) ; References (24) ; Tables (1)

Subject Areas:

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

Files:

TRIS, TRB, ATRI

Created Date:

Mar 20 1995 12:00AM

More Articles from this Serial Issue: