Published: 2024-04-10

General transition curves as an alternative to traditional horizontal curves in road alignment

Andrzej Kobryń

Abstract

The article presents selected solutions of the so-called general transition curves, used as an alternative to traditional horizontal curves. General transition curves enable description of the entire curvilinear transition between the two straight-line sections by means of only one equation. Analysis presented in this paper pertained to the specific case of symmetrical curves. It encompassed comparison of the basic geometric parameters of conventional curves and general transition curves based on a chord of the same length. The compared parameters included minimum radius values and middle ordinates for various curves with the same chord length, as well as chord lengths corresponding to various curves with the same radius. The analyses indicated that the greater the central angle of the entire curve, the greater the difference in geometry between traditional curves and those created using general transition curves. Consequently, use of general transition curves provides greater flexibility in shaping of horizontal alignment, which may prove advantageous in difficult terrain conditions.

Keywords:

general transition curves, horizontal curves, road alignment.

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Kobryń, A. (2024). General transition curves as an alternative to traditional horizontal curves in road alignment. Roads and Bridges - Drogi I Mosty, 23(1), 99–116. https://doi.org/10.7409/rabdim.024.005

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