Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/63316
Title: Simultaneous optimization of horizontal and vertical alignments for highways
Authors: Chew, E.P. 
Goh, C.J.
Fwa, T.F. 
Issue Date: Oct-1989
Source: Chew, E.P.,Goh, C.J.,Fwa, T.F. (1989-10). Simultaneous optimization of horizontal and vertical alignments for highways. Transportation Research Part B 23 (5) : 315-329. ScholarBank@NUS Repository.
Abstract: This paper presents the formulation of a three-dimensional highway alignment optimization model. The coordinates of the highway is parametrized by using a three-dimensional cubic spline polynomial interpolation. The solution is obtained by locating the optimal horizontal and vertical alignments simultaneously while subject to a wide range of possible constraints. These constraints may be bounds on the slope or curvature, as well as avoidance of inaccessible region. It is an extension from a previous research work where optimal vertical highway alignment was determined for a preselected horizontal alignment. Two numerical examples based upon the actual ground conditions in Singapore are presented to illustrate the applicability of the proposed model. Some computational details such as scaling and selection of initial variables which affect the rate of convergence are also briefly discussed. © 1989.
Source Title: Transportation Research Part B
URI: http://scholarbank.nus.edu.sg/handle/10635/63316
ISSN: 01912615
Appears in Collections:Staff Publications

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