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CE Home > People > Faculty Directory > Nikolas Geroliminis
Nikolas Geroliminis
Assistant Professor
Contact Information
Research interests
Traffic congestion is increasing in major cities. The construction of new infrastructure is not a feasible solution to
decrease congestion. My research to date has focused on developing more sustainable transportation systems by improving the
use of existing facilities. Specific areas of research include modeling and estimation of travel times and other performance
measures in arterials; location of emergency response vehicles in transportation networks; urban transportation and gridlock
in cities.
Current research focuses on macroscopic modeling the macroscopic modeling of traffic flow for overcrowded cities.
Understanding the physics of congestion is a necessary first step towards developing policies for mobility improvements, such
as pricing and control. This work shows that a Macroscopic Fundamental Diagram (MFD) relating production (the product of
average flow and network length) and accumulation (the product of average density and network length) exists for neighborhoods
of cities in the order of 5-10km2. It also demonstrates that conditional on accumulation large networks behave
predictably and independently of their Origin-Destination tables. These results are based on analysis using simulation of
large scale city networks and real data from urban metropolitan areas. This work also demonstrates that the dynamics of the
rush hour can be predicted quite accurately without the knowledge of disaggregated data. This MFD is applied to develop
perimeter control strategies based on neighborhood accumulation and speeds and improve accessibility without the uncertainty
inherent in today's forecast-based approaches. The looking-for-parking phenomenon that extends the average trip length is also
integrated in the dynamics of the rush hour.
Selected publications
Geroliminis N., Daganzo C.F., 2008, Existence of urban-scale macroscopic fundamental diagrams: Some experimental findings
(accepted for publication, Transportation Research, part B)
Skabardonis A., Geroliminis N., 2008, Real-time Monitoring and Control on Signalized Arterials (accepted for publication,
Journal of ITS)
Geroliminis N., Karlaftis M.G., Skabardonis A., 2007, A Spatial Queueing Model for the Emergency Vehicle Districting and
Location Problem (submitted for publication, Transportation Science)
Geroliminis N., Daganzo C.F., 2007, Macroscopic modeling of traffic in cities, 86th Annual Meeting Transportation Research
Board, Washington D.C.
Geroliminis N., Skabardonis A., 2005, Prediction of arrival profiles and queue lengths along signalized arterials using a
Markov decision process, Transportation Research Record, 1934, 116-124
Skabardonis A., Geroliminis N., 2005, Real-Time Estimation of Travel Times along Signalized Arterials, Transportation and
Traffic Theory, (editor H. Mahmassani) Maryland, Elsevier, 387-406
Education
- Diploma, 2003, Civil Engineering, National Technical University of Athens, Greece
- M.S., 2004, Civil and Environmental Engineering, University of California at Berkeley
- Ph.D., 2007, Civil and Environmental Engineering, University of California at Berkeley
Experience
- Researcher, University of California-Berkeley, 2003-2007
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