A model for calculating optimal vertical alignments of interchanges

Yusin Lee, Juey Fu Cheng

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In this paper we propose a model to calculate an optimal vertical alignment of an interchange with a given horizontal layout. The vertical profiles of all ramps in the interchange are solved simultaneously. The problem is formulated as a mixed integer program. A heuristic that can solve the problem very efficiently is also proposed. The model and heuristic were tested by applying the technique to a real life example, a full system interchange with 4 legs and 8 ramps. Comparison of the computational results with the real layout, which was designed by a major consulting firm, indicates that the model produces designs close to those of human experts.

Original languageEnglish
Pages (from-to)423-445
Number of pages23
JournalTransportation Research Part B: Methodological
Issue number5
Publication statusPublished - 2001 Jan 1

All Science Journal Classification (ASJC) codes

  • Transportation


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