IMPROVING STEEP BENDS AS HAIRPIN CURVES ON MOUNTAINOUS ROADS

In improving steep bends on mountainous roads, an alternative is to refashion the steep bend as a hairpin curve that, by lengthening the alignment, helps correct both the curvature and the gradient. This paper treats the hairpin in its entirety in an analytical procedure. The length and orientation of the line joining the center of the middle arc to the intersection of the approach tangents emerge as significant system parameters, affecting the deviation angles of the component curves and the tangent length requirements. The paper derives relationships that enable the deviation angles and the tangent lengths to be calculated in terms of given or chosen parameters. Examples are presented that illustrate the practical use of the relationships and the computational procedures.

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  • Accession Number: 00601557
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Nov 30 1990 12:00AM