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发表于 2005-12-25 04:31:02
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[跟踪报道]——“交通科学的理论与实践”研讨会(WTPTS’04)!
Optimization of Multi-modal Transport Networks with Motorized and Non-motorized Modes
William H.K. LAM Z.X. Wu
(Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong)
This paper addresses the problem of designing multi-modal transport networks with both the motorized and non-motorized modes particularly the walking mode, which is considered as a new discrete equilibrium network design problem (NDP). Specifically, the design problem is to determine the optimal pedestrianisation locations (i.e. the optimal set of pedestrian-only streets) in multi-modal transport systems, given a network of candidate pedestrian-only streets. In order to capture the interactions between the motorized and non-motorized modes in network, an equivalent variational inequality (VI) problem is formulated together with flow equilibrium and modal equity constraints. The modal equity constraints are introduced to balance the benefits and/or disbenefits to users of various transport modes, under a pedestrianisation scheme. A bi-level model is proposed to determine the optimal pedestrianisation locations: the upper level seeks to minimize the total cost of the multi-modal transport system while the lower level addresses the multi-modal network equilibrium problem. The lower level, formulated as a VI problem, allows for interactions between various transport modes, especially those between motorized and non-motorized modes. These interactions are of vital importance in Hong Kong’s multi-modal transport network, owing to the high traffic density and limited road space. A case study based on the central business district of Hong Kong, “Central”, is employed to illustrate the applications of the proposed model and solution algorithms.
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