Lateral Clearance Needs on Compound Horizontal Curves
Publication: Journal of Transportation Engineering
Volume 119, Issue 1
Abstract
The American Association of State Highway and Transportation Officials (AASHTO) and other models for evaluating the lateral clearance on horizontal circular curves are applicable only to simple curves. Employing these models for compound curves will underestimate or overestimate the lateral clearance needs, depending on whether the analysis is based on the flatter or the sharper arc of the compound curve. In this paper, the available sight distance on compound horizontal curves is formulated. The available sight distance is related to the parameters of the sharper and flatter arcs, the lateral clearance of the obstacle, its location within the sharper or flatter arc, and the locations of the driver and object. The minimum sight distance and sight distance profile of the compound curve may be considerably different from those of the simple curve. To facilitate practical use, values of are established for typical parameters of the compound curve.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
A policy on geometric design of highways and streets. (1990). American Assoc. of State Highway and Transp. Officials (AASHTO), Washington, D.C.
2.
Easa, S. M. (1991a). “Lateral clearance to vision obstacles on horizontal curves.” Transp. Res. Record, 1303, 22–32.
3.
Easa, S. M. (1991b). “Sight distance model for unsymmetrical crest curves.” Transp. Res. Record, 1303, 39–50.
4.
Easa, S. M. (1991c). “Sight distance models for unsymmetrical sag curves.” Transp. Res. Record, 1303, 51–62.
5.
Easa, S. M. (1991d). “Highway curves: Geometric and sight distance characteristics.” Report CE‐91‐4, Dept. of Civ. Engrg., Lakehead Univ., Thunder Bay, Ontario, Canada.
6.
Hickerson, T. F. (1964). Route location and design. McGraw‐Hill Book Co., New York, N. Y.
7.
Meyer, C. F, and Gibson, D. W. (1980). Route surveying and design. International Textbook Co., Scranton, Pa.
8.
Neuman, T. R., and Glennon, J. C. (1984). “Cost‐effectiveness of improvements to stopping sight distance.” Transp. Res. Record, 923, 26–34.
9.
Olson, P. L., Cleveland, D. E., Fancher, P. S., Kostyniuk, L. P., and Schneider, L. W. (1984). “Parameters affecting stopping sight distance.” NCHRP Report 270, Nat. Res. Council, Washington, D.C.
10.
Raymond, W. L. (1972). “Offsets to sight obstructions near the ends of horizontal curves.” Civ. Engrg., 42(1), 71–72.
11.
Waissi, G. R., and Cleveland, D. E. (1987). “Sight distance relationships involving horizontal curves.” Transp. Res. Record, 1122, 96–107.
Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 119 • Issue 1 • January 1993
Pages: 111 - 123
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Dec 16, 1991
Published online: Jan 1, 1993
Published in print: Jan 1993
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.