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Home | Seminars and Symposia | Past seminars/symposia: Friday, April 22, 2016

DTC Seminar Series

Node Dynamics in Urban Traffic Networks


Saif Jabari
New York University in Abu Dhabi

Friday, April 22, 2016
4:00 p.m. reception
4:30 p.m. seminar

401/402 Walter Library

First-order network flow models are systems of differential equations which describe the build-up and dissipation of congestion in a road network. Models describing flows across network intersections, referred to as node models, play the role of the coupling between the link dynamics and are responsible for capturing congestion spillover in the network. Two types of challenges arise when specifying the node models. The first are of a computational nature: state of the art models are computationally prohibitive when it comes to real-time traffic management applications. The second types of challenges pertain to the level of realism captured by the node models. Typically, these types of challenges go hand in hand; that is, the more realistic the model, the more computationally demanding it becomes. In this talk, it will be demonstrated how two real-world considerations actually simplify the node models considerably. These two considerations are the holding free property, which says that demands on an inbound link should proceed to their destination links as long as the supplies of the destination links allow it. The second is non-simultaneity of conflicting flows, which states that vehicles should not be allowed to cross paths.


Saif Jabari is an Assistant Professor of Civil and Urban Engineering at New York University in Abu Dhabi and also holds an appointment with New York University Tandon School of Engineering as Research Assistant Professor. His research interests lie at the interface between data analysis and theoretical traffic flow modeling. One of the main themes of his research is the development of methods for understanding and quantifying uncertainty in transportation systems.

Prior to joining NYUAD, Jabari was a Post-Doctoral Researcher in the Mathematical Sciences and Analytics Department at the IBM T.J. Watson Research Center in Yorktown Heights, NY. Jabari received his Ph.D. in Civil Engineering from the University of Minnesota, Twin Cities in 2012 and his B.Sc. degree in Civil Engineering from the University of Jordan in 2001. His doctoral dissertation received the 2012 Milton Pikarsky Memorial Award for best dissertation in Science and Technology.