TY - JOUR
T1 - A model for calculating optimal vertical alignments of interchanges
AU - Lee, Yusin
AU - Cheng, Juey Fu
PY - 2001/1/1
Y1 - 2001/1/1
N2 - 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.
AB - 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.
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U2 - 10.1016/S0191-2615(99)00058-2
DO - 10.1016/S0191-2615(99)00058-2
M3 - Article
AN - SCOPUS:0035371930
SN - 0191-2615
VL - 35
SP - 423
EP - 445
JO - Transportation Research, Series B: Methodological
JF - Transportation Research, Series B: Methodological
IS - 5
ER -