PacTrans Calendar of Events
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PacTrans-sponsored Transportation Talk
February 15, 2013 @ 12:00 pm - 1:00 pm
Title: Modeling of the Heteroscedastic Traffic Speed Variance Using Virtual Loop Detector Data
Speaker: Haizhong Wang, assistant professor, Oregon State University
[Abstract] Traffic speed variance is defined as a measure of the dispersion of space mean speeds among drivers. Empirical speed-density observations exhibit a structured traffic speed variance which has been found to be associated to the road accident rate, the fatality rate, and travel time variability. The objective of this talk is to share the empirical findings from the GA400 and propose a generalized traffic speed variance function to describe this structured variance. In nature, the proposed speed variance function is a response of the speed-density curve with two additional parameters. A series of logistic speed-density curve with varying parameters is used in the proposed traffic speed variance function with varying performances. This traffic speed variance model can be potentially used to quantify the safety risk in a more rigorous manner.
[Short Biography] Dr. Haizhong Wang joins OSU from the Trine University in Angola, Indiana where he worked as assistant professor with the Reiners Department of Civil and Environmental Engineering. Before joining Trine University, he spent a short time as a research associate with Institute for Multimodal Transportation at Jackson State University in Jackson, Mississippi. His experience in the operation, planning, modeling, and simulation of multimodal transportation system serves as the foundation for his current research and teaching interests. Dr. Wang’s research interests include the mathematical modeling and simulation of the multimodal transportation system at varying levels (macroscopic, mesoscopic, and microscopic), stochastic modeling and probabilistic predictions, traffic flow theory and optimization, transportation system analysis and planning, emergency management and disaster response.
