Ali Hajbabaie

Assistant Professor

  • 919-515-5938
  • Fitts-Woolard Hall 3203

Dr. Ali Hajbabaie is an Assistant Professor in the Department of Civil, Construction, and Environmental Engineering at NC State University. He is primarily associated with the “Transportation Systems” and “Computing and Systems” groups within the Department.

After receiving his Ph.D., Dr. Hajbabaie was a postdoctoral research scholar at the Institute for Transportation Research and Education at NC State. He then moved to Washington State University where he was an Assistant Professor in the Department of Civil and Environmental Engineering from 2014 to 2019.

Dr. Hajbabaie has served as the Secretary of the Work Zone Traffic Control standing committee of the Transportation Research Board (TRB) of the National Academies of Sciences, Engineering, and Medicine since 2014 and as the Chair of the Asset Management Subcommittee of the Traffic Signal Systems Committee of the TRB.

Dr. Hajbabaie teaches courses such as Traffic Engineering, Advanced Traffic Control, Traffic Flow Theory, and Traffic Operations.


Ph.D. 2012

Civil Engineering

University of Illinois at Urbana - Champaign

M.S. 2011

Industrial Engineering

University of Illinois at Urbana - Champaign

M.S. 2006

Civil Engineering

Sharif University of Technology

B.S. 2003

Civil Engineering

Sharif University of Technology

Research Description

Dr. Hajbabaie is interested in real-time optimization of large-scale complex engineering systems represented by models with a high degree of realism. His research is focused on traffic operations and control in the presence of connected human-driven and self-driving cars. Dr. Hajbabaie and his research group use multi-scale analysis, modeling, and optimization to improve traffic operations. His research is advancing our understanding of cooperative traffic control systems and contributes to the development of future mobility systems, including connected and automated vehicles.

Honors and Awards

  • Best Dissertation Award – Honorary Mention, Transportation Research Board, 2022
  • Sweet 16 High Value Research, American Association of State Highway and Transportation Officials, 2021
  • Certificate of Excellence, Work Zone and Traffic Control Committee, the Transportation Research Board, National Academy of Sciences, 2019
  • Outstanding Junior Researcher, the Department of Civil and Environmental Engineering, Washington State University, 2018
  • Best Paper Award, Transportation Research Record: Journal of the Transportation Research Board, Work Zone Traffic Control Committee, 2016
  • Best Student Paper Award, Transportation & Development Institute’s Congress, American Society of Civil Engineers, 2011
  • Best Paper Award, Institute of Transportation Engineers, Illinois Section, 2010


A Distributed Gradient Approach for System Optimal Dynamic Traffic Assignment
Mehrabipour, M., & Hajbabaie, A. (2022, April 20), IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS, Vol. 4, pp. 1–15.
Effects of Autonomous Driving Behavior on Intersection Performance and Safety in the Presence of White Phase for Mixed-Autonomy Traffic Stream
Niroumand, R., Hajibabai, L., Hajbabaie, A., & Tajalli, M. (2022, April 11), TRANSPORTATION RESEARCH RECORD, Vol. 4, p. 036119812210825.
Testing Connected Vehicle-Based Accident Mitigation for Red-Light Violation Using Simulation Strategies
Tajalli, M., Bin Al Islam, S. M. A., List, G. F., & Hajbabaie, A. (2022, March 11), TRANSPORTATION RESEARCH RECORD, Vol. 3.
Using COVID-19 Data on Vaccine Shipments and Wastage to Inform Modeling and Decision-Making
Hajibabai, L., Hajbabaie, A., Swann, J., & Vergano, D. (2022), Transportation Science, 4.
An Enhanced Cell Transmission Model for Multi-Class Signal Control
Bin Al Islam, S. M. A., & Hajbabaie, A. (2021, August 10), IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS, Vol. 8.
Connected automated vehicle control in single lane roundabouts
Effects of Connectivity and Traffic Observability on an Adaptive Traffic Signal Control System
Bin Al Islam, S. M. A., Tajalli, M., Mohebifard, R., & Hajbabaie, A. (2021, May 24), TRANSPORTATION RESEARCH RECORD, Vol. 5, p. 036119812110130.
Network-Level Coordinated Speed Optimization and Traffic Light Control for Connected and Automated Vehicles
Tajalli, M., Mehrabipour, M., & Hajbabaie, A. (2021), IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS, 22(11), 6748–6759.
Stochastic Gradient-Based Optimal Signal Control With Energy Consumption Bounds
Bin Al Islam, S. M. A., Abdul Aziz, H. M., & Hajbabaie, A. (2021), IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS, 22(5), 3054–3067.
Traffic Signal Timing and Trajectory Optimization in a Mixed Autonomy Traffic Stream
Tajalli, M., & Hajbabaie, A. (2021, February 17), IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS, Vol. 2.

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SCC: Serving Households in AReas with food Insecurity with a Network for Good: SHARING
National Science Foundation (NSF)(10/01/21 - 9/30/25)
RAPID: Supporting Efficient and Equitable COVID-19 Vaccine Distribution and Administration: Exploring Challenges and Opportunities through Data Analytics
National Science Foundation (NSF)(6/01/21 - 5/31/22)
Groundwork for the Second Edition of the Alternative Intersection and Interchange Informational Report (2022-011)
NC Department of Transportation(8/01/21 - 10/31/22)
STRIDE: Integrated Corridor Management: Cooperative Signal Control with Freeway Operations and Ramp Metering
US Dept. of Transportation (DOT)(8/16/20 - 5/15/22)
NCHRP- Guide for the Formulation of Long-Range Plans and Budgets for Replacement of Highway Operations Equipment
Federal Highway Administration (FHWA)(5/18/20 - 2/17/22)
Preparing for Traffic Signal operations in a Multi-Modal Connected & Autonomous Vehicle Environment
Washington State Department of Transportation(8/16/19 - 12/31/20)
NCDOT University Transportation Center of Excellence on Mobility and Congestion
NC Department of Transportation(2/01/20 - 7/31/22)
Evaluation of Life Cycle Impacts of Intersection Control Type Selection
NC Department of Transportation(8/16/13 - 2/29/16)
IMAP-Assessment of Benefits/Costs, Route Selection, and Prioritization
NC Department of Transportation(8/16/13 - 5/15/16)