Abstract
The dynamic and stochastic shortest path problem (DSSPP) is defined as finding the expected shortest path in a traffic network where the link travel times are modeled as a continuous-time stochastic process. The objective of this paper is to examine the properties of the problem and to identify a technique that can be used to solve the DSSPP given information that will be available in networks with Intelligent Transportation System (ITS) capabilities. The paper first identifies a set of relationships between the mean and variance of the travel time of a given path and the mean and variance of the dynamic and stochastic link travel times on these networks. Based on these relationships it is shown that the DSSPP is computationally intractable and traditional shortest path algorithms cannot guarantee an optimal solution. A heuristic algorithm based on the k-shortest path algorithm is subsequently proposed to solve the problem. Lastly, the trade-off between solution quality and computational efficiency of the proposed algorithm is demonstrated on a realistic network from Edmonton, Alberta.
Original language | English (US) |
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Pages (from-to) | 499-516 |
Number of pages | 18 |
Journal | Transportation Research Part B: Methodological |
Volume | 32 |
Issue number | 7 |
DOIs | |
State | Published - Sep 1998 |
Externally published | Yes |
Keywords
- Dynamic and stochastic network
- Intelligent Transportation Systems
- Route Guidance Systems
- Shortest path problem
- Traffic network
- k-shortest path problem
ASJC Scopus subject areas
- Civil and Structural Engineering
- Transportation