Title page for ETD etd-07132006-094645


Type of Document Dissertation
Author Alecsandru, Ciprian Danut
Author's Email Address calecs1@lsu.edu
URN etd-07132006-094645
Title A Stochastic Mesoscopic Cell-Transmission Model for Operational Analysis of Large-Scale Transportation Networks
Degree Doctor of Philosophy (Ph.D.)
Department Civil & Environmental Engineering
Advisory Committee
Advisor Name Title
Sherif Ishak Committee Chair
Brian Wolshon Committee Member
Charles McAllister Committee Member
Chester G. Wilmot Committee Member
Randy R. Price Dean's Representative
Keywords
  • traffic simulation
  • cell transmission model
Date of Defense 2006-06-14
Availability unrestricted
Abstract
The cell transmission model (CTM), developed by Daganzo in 1994 was not fully exploited as an operations model for analysis of large-scale traffic networks. Because of its macroscopic / mesoscopic features, CTM offers calibration and computational advantages over microscopic models. This study presents a series of enhancements to the original form of CTM. These enhancements show potential to increase the modelís accuracy and realism of traffic flow representation. For example, topological enhancements and modifications to the flow advancing equation are introduced to allow variable cell lengths and non-discrete movements of vehicles between cells. In addition, implementation of lane-changing behavioral logics and algorithmic enhancements to model vehicle flows at network junctions demonstrate potential in modeling realistic non-homogeneous traffic streams in CTM. A calibration exercise was conducted to account for randomness in driving behavior using vehicle trajectory data. This proves the models potential in modeling stochastic variations of real-life networks. A sample freeway network of I-10 corridor in Baton Rouge was used to evaluate and compare the performance of the improved version of CTM versus CORSIM. The simulation results showed comparable performance of both platforms in terms of link occupancy (density) and total network travel time and demonstrate the potential of employing CTM in traffic operations applications.
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