Microscopic traffic simulation serves as a powerful tool for comprehensive modeling and analysis of individual vehicle behaviors and traffic flow dynamics. However, ensuring the accuracy and reliability of simulation outcomes necessitates meticulous model calibration. This calibration process involves refining the model parameters to closely align with real-world observations, thereby enhancing the simulation's ability to replicate actual traffic scenarios. Although various studies have explored methods to improve the calibration performance of car following (CF) and lane changing (LC) models, the majority have focused on developing algorithms applicable to specific traffic conditions, leaving a significant gap in a systematic framework for simultaneous CF and LC model calibration. Consequently, this thesis proposes a novel approach to calibrate CF and LC models within a microscopic traffic simulation framework, leveraging drone-based vehicle trajectories. The approach encompasses several key steps: firstly, a clustering method is introduced to classify observed trajectories into distinct CF groups, enabling optimization of CF model parameters by calibrating individual vehicle trajectories. Secondly, the LC model is calibrated using heuristic algorithms to minimize discrepancies between observed and simulated LC timing, with the calibrated CF model acting as the controller for longitudinal movement simulation. Finally, the correlation between CF and LC model parameters is examined, leading to the derivation of a joint parameter distribution. When simulating stochastic traffic flow, each generated vehicle is assigned a parameter set from this distribution. Evaluation of the calibration method on the CitySim FreewayB dataset demonstrates improved performance compared to conventional calibration methods, as evidenced by enhanced vehicle trajectory simulations. The proposed framework thus offers valuable insights into achieving accurate CF and LC model calibration.
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Master of Science (M.S.)
College of Engineering and Computer Science
Civil, Environmental, and Construction Engineering
Civil Engineering; Smart Cities Track
Length of Campus-only Access
Masters Thesis (Campus-only Access)
Wang, Zijin, "Model Calibration for Microscopic Traffic Simulation Using Drone-Based Vehicle Trajectory Data" (2023). Electronic Theses and Dissertations, 2020-. 1742.
Restricted to the UCF community until August 2024; it will then be open access.