University: 

TRB Category: 

Eleni Christofa

Assistant Professor
UMassAmherst


Research and Background

I have research experience in traffic operations, management, and safety with a focus on multimodal transportation systems. Recent and ongoing research has focused on the development of real-time signal control systems to achieve various sustainability goals or combinations of those such as minimization of person delay, and emissions, at both isolated intersections and signalized arterial networks with the use of data from intelligent transportation systems. Real-time signal control algorithms have also been developed to reduce congestion by preventing the occurrence of spillbacks and mitigating the impact of bus stops on the rest of the traffic. I have also been developing optimal cycle length formulas appropriate for implementation when transit signal priority is in place. Another aspect of my work has been on the impact of transit preferential treatments such as dedicated bus lanes, queue jumper lanes, and transit signal priority on person discharge flow and person delay as well as utilizing information from innovative technologies (e.g., connected vehicles, automated vehicle location systems) to estimate traffic conditions. A big part of my ongoing research is related to the operations, safety, and environmental implications of roundabouts. Geometric aspects (e.g., deflection angle), demand patterns, (e.g., vehicle demand and pedestrian demand at roundabout crosswalks), as well as the presence of visually impaired pedestrians are all parameters that I consider in my research related to understanding driver behavior and estimating emissions at roundabouts. A recent focus of my work has been in understanding driver behavior at intersections under the presence of innovative bicycle infrastructure systems such as bike boxes and protected intersections. The overarching goal of my research is to enhance infrastructure design and signal control strategies to improve person mobility, air quality, and safety for all users.

Contact Info

Eleni Christofa
christofa@ecs.umass.edu
216 Marston Hall, College of Engineering, Department of Civil & Environmental Engineering, University of Massachusetts,
Amherst, Massachusetts 01003

Research

Traffic Operations and Control

Sustainable Traffic Management

Public Transportation Systems

Intelligent Transportation Systems

Transportation Safety

Program Area:

Transportation Engineering

Education

PhD, Civil & Environmental Engineering, University of California Berkeley, 2012MSc, Civil & Environmental Engineering, University of California, Berkeley, 2008Diploma, Civil Engineering, National Technical University of Athens, Greece, 2007

Publications

*Fournier, N., Christofa, E., and Knodler, M.A. 2017. A Sinusoidal Model for Seasonal Bicycle Demand Estimation. Transportation Research Part D: Transport and the Environment, 50:154–169.

Chavis,C.,and Christofa,E., A Real-Time Signal Control Strategy for Mitigating the Impact of Bus Stops at Urban Signalized Arterials. Journal of Intelligent Transportation Systems: Technology, Planning, and Operations.[accepted]

*Farid,Y.Z., Christofa,E., and Paget-Seekins, L.2016. Short Term Bus Travel Time Estimation Using Low Resolution Automated Vehicle Location Data. Transportation Research Record: Journal of the Transportation Research Board,2539,doi:10.3141/2539-13

*Wolput,B., Christofa,E., and Tamp´ere, C. M. J. 2016. Optimal Cycle Length Formulas for Inter-sections with or without Transit Signal Priority. Transportation Research Record: Journal of the Transportation Research Board, 2558,doi:10.3141/2558-084.

*Roach,D.,Christofa,E.,and Knodler Jr., M.A. 2015. Safety Assessment before and after Implementation of Roundabouts through Microsimulation .Advances in Transportation Studies, an International Journal, 2016 Special Issue,Vol.2.

Christofa,E.,Ampountolas,K.,and Skabardonis,A.2016. Arterial Traffic Signal Optimization: A Person-based Appraoch. Transportation Research Part C: Emerging Technologies, 66:27:47.

*Farid, Y.Z.,Christofa, E., and Collura, J. 2015. Person-Based Evaluation of Dedicated Bus Lanes and Queue Jumper Lanes at Signalized Intersections with Near-Side Bus Stops.Transportation Research Record: Journal of the Transportation Research Board, 2484:182–192, doi:10.3141/2484-20.

*Khalighi, F., and Christofa, E. 2015. Emission-based Signal Timing Optimization for Isolated Intersections.Transportation Research Record: Journal of the Transportation Research Board, 2487:1–14, doi:10.3141/2487-01.

Argote-Cabănero, J.,Christofa, E., and Skabardonis, A. 2015. Connected Vehicle Penetration Rate for Estimation of Arterial Measures of Effectiveness.Transportation Research Part C: Emerging Technologies, 60:298–312, doi: 10.1016/j.trc.2015.08.013.

Gonzales, E.J., and Christofa, E. 2014. Empirical Assessment of Bottleneck Congestion with a Constant and Peak Toll: San Francisco-Oakland Bay Bridge. EURO Journal on Transport and Logistics, 3(34):267–288

Christofa, E., Papamichail, I., and Skabardonis, A. 2013. Person-based Traffic Responsive Signal Control Optimization. IEEE Transactions on Intelligent Transportation Systems, 14(3):1278–1289.

Christofa, E., Argote, J. and Skabardonis, A. 2013. Arterial Queue Spillback Detection and Signal Control based on Connected Vehicle Technology. Transportation Research Record: Journal of the Transportation Research Board, 2356:61–70.

Gonzales, E.J., and Christofa, E. 2013. Empirical Assessment of Bottleneck Congestion with a Constant and Peak Toll: San Francisco-Oakland Bay Bridge. EURO Journal on Transport and Logistics. DOI 10.1007/s13676-013-0036-y

Reger, D., Christofa, E., Guler, I., and Madanat, S. 2013. Estimation of Pavement Crack Initiation Models by Combining Experimental and Field Data. ASCE Journal of Infrastructure Systems, 19(4):434–441.

Skabardonis, A., Geroliminis, N., and Christofa, E. 2013. Prediction of Vehicle Activity for Emissions Estimation Under Oversaturated Conditions Along Signalized Arterials. Journal of Intelligent Transportation Systems, 17(3):191-199.6.

Christofa, E., and Skabardonis, A. 2011. Traffic Signal Optimization with Application of Transit Signal Priority to an Isolated Intersection. Transportation Research Record, 2259:192-201, doi: 10.3141/2259-18

Skabardonis, A., Shladover, S., Christofa, E., et al. 2013. Advanced Traffic Control Signal Algorithms. Final Report for Interagency Agreement #65A0376, FHWA Exploratory Advanced Research Program Cooperative Agreement DTFH61-10-H-00002.

Campbell, R., Christofa, E., Argote, J., Gayah, V., Guler, I., and Skabardonis, A. 2012. Operating a Diverging Diamond Interchange: A signal timing optimization strategy. Report submitted to the Transportation Research Board Traffic Signal Systems Committee.

Christofa, E. 2012. Traffic Signal Optimization with Transit Priority: A Person-based Approach. PhD Dissertation, University of California, Berkeley.

Christofa, E. 2007. Travel Time Estimation in Signalized Arterials Under Incident Conditions. Diploma Thesis, National Technical University of Athens (In Greek).

Refereed Conference Publications

*Farid,Y.Z.,and Christofa,E. Short-Term Bus Travel Time Estimation Using Low Resolution Auto-mated Vehicle Location Data. Transportation Research Board 95th Annual Meeting,10–14 January, Washington, D.C., PaperNo. 16-0166.

*Fournier,N., Christofa, E.,and Knodler, M. The Bicycle Cycle: A Sinusoidal Modal for Predicting Bicycle Demand. Transportation Research Board 95th Annual Meeting, 10–14 January, Washington, D.C., Paper No.16-4182.

*Wolput,B.,Christofa,E.,and Tamp´ere, C.M.J. Optimal Cycle Length Formulas for Intersections with or without Transit Signal Priority. Transportation Research Board 95th Annual Meeting, 10–14January, Washington, D.C., PaperNo.16-1804.

*Roach,D., Christofa, E.,and Knodler Jr.,M.A.2015. Roundabout Safety Assessment through Microsimulation. 2015 Road Safety & Simulation International Conference, 6–8 October, Orlando, FL.

*Tainter,F., Knodler,Jr.,M.A.,*Fitzpatrick,C.,and Christofa, E.2015. Analysis of Driver Performance and Operations at Intersection Auxiliary Through Lanes. 2015 Road Safety & Simulation International Conference, 6–8 October, Orlando, FL.

*Wolput,B.,Tamp´ere,C.M.J.,and Christofa, E..2015. A New Stochastic Mesomodel for Opti-mizing Multi-Modal Signal Settings for Networks. 2015 IEEE 18th International Conferenceon Intelligent Transportation Systems,15–18 September, Canary Islands,Spain.

*Farid, Y.Z., Christofa, E., and Collura, J. Person-based Evaluation of Transit Preferential Treatments on Signalized Arterials. Transportation Research Board 93rd Annual Meeting, 12–16 January, Washington, D.C., Paper No. 13-2995.

*McKinnon, I., Knodler, M., and Christofa, E. 2013. Operational and Safety-based Analyses of Varied Toll Plaza Configurations. Road Safety and Simulation–International Conference, 22–25 October, Rome, Italy.

Christofa, E., Aboudolas, K., and Skabardonis, A. 2013. Arterial Traffic Signal Optimization: A Person-based Approach. Transportation Research Board 92nd Annual Meeting, 13–17 January, Washington, D.C., Paper No. 13-3395.

Christofa, E., Argote, J., and Skabardonis, A. 2013. Arterial Queue Spillback Detection and Signal Control based on Connected Vehicle Technology. Transportation Research Board 92nd Annual Meeting, 13–17 January,Washington, D.C., Paper No. 13-4903.

Christofa, E., Papamichail, I., and Skabardonis, A. 2012. Person-based Traffic Signal Optimization for Real-Time Applications. Transportation Research Board 91st Annual Meeting, 22–26 January, Washington, D.C., Paper No. 12-2228.

Argote, J., Christofa, E., Xuan, Y., and Skabardonis, A. 2012. Estimation of Arterial Measures of Effectiveness with Connected Vehicle Data. Transportation Research Board 91stAnnual Meeting, 22–26 January,Washington, D.C., Paper No. 12-1493.

Skabardonis, A., Geroliminis, N., and Christofa, E. 2012. Vehicle Emissions Estimation Under Oversaturated Conditions along Signalized Arterials. Transportation Research Board 91st Annual Meeting, 22–26 January,Washington, D.C., Paper No. 12-3899.

Argote, J., Christofa, E., Xuan, Y., and Skabardonis, A. 2011. Estimation of Measures of Effectiveness based on Connected Vehicle Data. 14th International IEEE Conference on Intelligent Transportation Systems, 5–7 October,Washington, D.C.

Skabardonis, A., and Christofa, E. 2011. Impact of Transit Signal Priority on Level of Service at Signalized Intersections. 6th International Symposium on Highway Capacity and Quality of Service World Congress, June 28–July 1, Stockholm, Sweden.

Skabardonis, A., and Christofa, E. 2011. Evaluation of Methodologies for the Design and Analysis of Freeway Weaving Sections. 1st International Conference on Access Management, 14–17 June, Athens, Greece.

Christofa, E., and Skabardonis, A. 2011. Traffic Signal Optimization with Transit Signal Priority: Application to an Isolated Intersection. Transportation Research Board 90th Annual Meeting, 23–27 January,Washington, D.C., Paper No. 11-3092.

Skabardonis, A., Geroliminis, N., and Christofa, E. 2010. Improved Analysis Framework for Emissions Estimation Under Oversaturated Conditions Along Signalized Arterials. 5th International Congress on Transportation Research in Greece, 27–28 September, Volos, Greece.

Christofa, E.M., and Skabardonis, A. 2010. Traffic Signal Optimization with Conditional Transit Signal Priority for Conflicting Transit Routes. 12th World Conference on Transportation Research, 11–15 July, Lisbon, Portugal.

Christofa, E.M., and Madanat, S.M. 2010. Development of Pavement Crack Initiation Models by Combining Experimental and Field Data. Transportation Research Board 89thAnnual Meeting, 10–14 January,Washington, D.C., Paper No. 10-1096.

Christofa, E.M., and Vlahogianni, E.I. 2008. Incident Impacts on Travel Time on Urban Signalized Arterials. 10th ASCE International Conference on Application of Advanced Technologies in Transportation (AATT), 27–31 May, Athens, Greece.

Recent Research Contracts Funded

Christofa, E.(co-PI) with M.Ben-Akiva, J.Trancik, E.Frazzoli, S.Gao, M., L.S. Peh, and F. Pereira. Mobility Electronic Market for Optimized Travel. U.S. Department of Energy, Advanced Research Projects Agency-Energy (ARPA-E). 2015–2018

Christofa,E.(PI) with M.A. Knodler. Operational and Emission Analyses of Round-abouts under Varied Vehicle and Pedestrian Demands. U.S. Department of Transportation through the New England University Transportation Center. 2014–2016

Christofa,E.(co-PI) with M.A. Knodler, D.L. Fisher, and D.Ni. SAFERSIM University Transportation Center. 2014–2016

Christofa, E. (PI) Signal Timing Optimization for Improved Mobility and Air Quality. U.S. Department of Transportation through the New England University Transportation Center. 2013–2014

Christofa, E. (PI) and Collura, J. A Person-based Comparison of Transit Preferential Treatments on Signalized Arterial Corridors. U.S. Department of Transportation through the New England University Transportation Center. 2012–2013

Curriculum Vitae

Curriculum Vitae