Historical traffic-tolerant paths in road networks

Pao Yue-kong Library Electronic Theses Database

Historical traffic-tolerant paths in road networks

 

Author: Li, Pui Hang
Title: Historical traffic-tolerant paths in road networks
Degree: M.Phil.
Year: 2015
Subject: Choice of transportation -- Mathematical models.
Urban transportation.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Computing
Pages: xvi, 69 pages : illustrations (some color) ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2816363
URI: http://theses.lib.polyu.edu.hk/handle/200/8085
Abstract: Nowadays, with the extensive installation of roadside sensors and the advance-ment of mobile technology, historic traffic information is widely collected. It is valuable in transportation analysis and planning, e.g., evaluating the reliability of routes for representative source-destination pairs. Also, it can be utilized to provide efficient and effective route-search services. In view of these applications, this thesis proposes the traffic-tolerant path (TTP) problem in road networks. The problem takes an integer k, a source-destination (SD) pair, and historic traffic information as input, and returns k paths that minimize the aggregate historic travel time. Unlike the shortest path problem, the TTP problem has a combinatorial search space that renders the optimal solution expensive to com-pute. First, we prove the NP-hardness of the TTP problem. Second, we propose an exact algorithm with effective pruning rules to reduce the search time. Third, we develop an anytime heuristic algorithm that makes 'best-effort' to find a low-cost solution within a given time limit. Extensive experiments on real and synthetic traffic data demonstrate the effectiveness of TTPs and the efficiency of our proposed algorithms.

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