Length Requirements for New Single-Arc Unsymmetrical Crest Vertical Curve for Highways

Jian Cheng Sun; Chen Feng Chen

doi:10.4028/www.scientific.net/AMR.1065-1069.755

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 1065-1069Length Requirements for New Single-Arc...

Length Requirements for New Single-Arc Unsymmetrical Crest Vertical Curve for Highways

Abstract:

Existing highway vertical curves may be grouped into two categories: symmetrical vertical curves and unsymmetrical vertical curves. In the past vertical curves design, parabolic arc was used as the vertical curve. This paper presents the new single-arc unsymmetrical vertical curve which is include only one cubic parabola. This curve has the gradual change of the rates of change in grade so that it can provide more comfort to the driver. This paper mainly presents the method by which to find the minimum length for a new single-arc unsymmetrical crest vertical curve based on the minimum sight distance . The discussion will be divided into two situations: the sight distance is longer than the curve length and the sight distance is not longer than the curve length.

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Periodical:

Advanced Materials Research (Volumes 1065-1069)

Pages:

755-759

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1065-1069.755

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Online since:

December 2014

Authors:

Jian Cheng Sun, Chen Feng Chen

Keywords:

Cubic Parabola, Highway Alignment Design, Minimum Length, Vertical Curve

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References

[1] JTG D20-2006 Design Specification for Highway Alignment, China communication press, China(In Chinese).

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