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Title:

Superelevation Design for Sharp Horizontal Curves on Steep Grades

Accession Number:

01516024

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States
Order URL: http://www.trb.org/Main/Blurbs/171937.aspx

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Order URL: http://worldcat.org/isbn/9780309295345

Abstract:

The objective of this study was to develop superelevation criteria for sharp horizontal curves on steep grades. Field studies were undertaken and vehicle dynamics simulations (point mass, bicycle, and multibody) were performed to investigate combinations of horizontal curve and vertical grade design criteria. The vehicle dynamics simulations used AASHTO design criteria and field-measured data to investigate the safety margins against skidding and rollover for several vehicle types on sharp horizontal curves with steep grades. Research results indicated that for a simple horizontal curve, the maximum rate of superelevation should not exceed 12% on a downgrade. A spiral curve transition is recommended if the maximum superelevation rate is greater than 12%. On upgrades of 4% and greater, the maximum superelevation rate should be limited to 9% for minimum-radius curves under certain conditions. The superelevation attained at the point of curve entry should be checked and compared with a lateral friction margin condition so that the lateral friction margin on curve entry is not less than the margin within the curve. On multilane highways, the "Stay in Lane" sign should be installed in advance of sharp horizontal curves on steep downgrades.

Monograph Accession #:

01550529

Report/Paper Numbers:

14-4501

Language:

English

Authors:

Torbic, Darren J
Donnell, Eric
Brennan, Sean N
Brown, Alexander
O’Laughlin, Mitchell K
Bauer, Karin M

Pagination:

pp 81–91

Publication Date:

2014

Serial:

Transportation Research Record: Journal of the Transportation Research Board

Issue Number: 2436
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

9780309295345

Media Type:

Print

Features:

Figures (4) ; References (15) ; Tables (2)

Uncontrolled Terms:

Steep grades

Subject Areas:

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

Files:

PRP, TRIS, TRB, ATRI

Created Date:

Jan 27 2014 3:34PM

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