Mehrdad Tajalli

College of Engineering

Works (9)

Updated: August 31st, 2023 05:00

2023 journal article

Effects of Connectivity and Automation on Saturation Headway and Capacity at Signalized Intersections

Transportation Research Record: Journal of the Transportation Research Board, 8.

By: A. Hajbabaie n , M. Tajalli n & E. Bardaka n 

author keywords: operations; traffic signal systems
TL;DR: Results show that increasing CV and CAV market-penetration rate reduces saturation headway and consequently increases capacity at signalized intersections and on the other hand, increasing the AV market-Penetration rates deteriorates traffic operations. (via Semantic Scholar)
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Sources: Web Of Science, ORCID, NC State University Libraries, Crossref
Added: August 12, 2023

2022 journal article

Effects of Autonomous Driving Behavior on Intersection Performance and Safety in the Presence of White Phase for Mixed-Autonomy Traffic Stream

Transportation Research Record: Journal of the Transportation Research Board, 2676(8), 112–130.

By: R. Niroumand n, L. Hajibabai n , A. Hajbabaie n  & M. Tajalli n

author keywords: operations; traffic signal systems
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Sources: Web Of Science, ORCID, NC State University Libraries, Crossref
Added: April 14, 2022

2022 journal article

Testing Connected Vehicle-Based Accident Mitigation for Red-Light Violation Using Simulation Strategies

Transportation Research Record: Journal of the Transportation Research Board, 2676(6), 583–600.

By: M. Tajalli n, S. Al Islam  n, G. List n  & A. Hajbabaie n 

author keywords: connected vehicles; microscopic traffic simulation; operations; traffic flow theory and characteristics; traffic simulation
TL;DR: This paper presents new ideas about how to do assessments of the value of vehicle to vehicle, vehicle to infrastructure, and vehicle to pedestrian communications in preventing crashes because of red-light violation at signalized intersections, and suggests that the number of near-crash events can be reduced significantly if V2V and V2P communications are implemented. (via Semantic Scholar)
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Sources: Web Of Science, ORCID, NC State University Libraries, Crossref
Added: March 12, 2022

2021 journal article

Effects of Connectivity and Traffic Observability on an Adaptive Traffic Signal Control System

Transportation Research Record: Journal of the Transportation Research Board, 2675(10), 800–814.

By: S. Islam  n, M. Tajalli n, R. Mohebifard n  & A. Hajbabaie n 

TL;DR: The results showed that a 40% CV market share was required for the adaptive signal controller using only CV data to outperform signal control with only loop detector data, and integrating 10% of CV data with loop detectors data in the adaptive sign control improved traffic performance and travel time reliability. (via Semantic Scholar)
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Sources: Web Of Science, ORCID, NC State University Libraries, Crossref
Added: June 30, 2021

2021 journal article

Network-Level Coordinated Speed Optimization and Traffic Light Control for Connected and Automated Vehicles

IEEE Transactions on Intelligent Transportation Systems, 22(11), 6748–6759.

By: M. Tajalli n, M. Mehrabipour n & A. Hajbabaie n 

author keywords: Optimization; Delays; Throughput; Trajectory; Fuels; Real-time systems; Connected and automated vehicles; distributed coordination; signal timing optimization; speed harmonization
TL;DR: The results show that coordinated signal timing and speed optimization improved network performance in comparison with cases that either signal timing parameters or average speed of vehicles are optimized. (via Semantic Scholar)
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Sources: Web Of Science, ORCID, NC State University Libraries, Crossref
Added: June 6, 2020

2021 journal article

Traffic Signal Timing and Trajectory Optimization in a Mixed Autonomy Traffic Stream

IEEE Transactions on Intelligent Transportation Systems, 23(7), 6525–6538.

By: M. Tajalli n & A. Hajbabaie n 

author keywords: Timing; Trajectory optimization; Fuels; Delays; Complexity theory; Vehicle dynamics; Green products; Signal timing; trajectory optimization; connected and automated vehicles; Lagrangian relaxation
TL;DR: The developed methodology provides a balance between computational efficiency and solution quality by linearizing the nonlinear constraints and reformulating the problem with a tight convex hull of the mixed-integer solutions and decomposing the intersection-level program into several lane-level programs. (via Semantic Scholar)
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7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries, Crossref
Added: February 21, 2021

2021 journal article

Utilization and Cost Estimation Models for Highway Fleet Equipment

Transportation Research Record: Journal of the Transportation Research Board, 2675(12), 1172–1186.

By: M. Tajalli n, A. Mirheli  n, A. Hajbabaie n  & L. Hajibabai n 

TL;DR: This research has identified annual mileage as an appropriate and widely used utilization metric and a set of predictive models to estimate the annual utilization of seven non-stationary highway equipment types based on several explanatory variables including their annual fuel cost, downtime hours, age, and weight. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries, Crossref
Added: August 25, 2021

2020 journal article

Joint optimization of vehicle-group trajectory and signal timing: Introducing the white phase for mixed-autonomy traffic stream

Transportation Research Part C: Emerging Technologies, 116, 102659.

By: R. Niroumand n, M. Tajalli n, L. Hajibabai n  & A. Hajbabaie n 

Contributors: R. Niroumand n, M. Tajalli n, L. Hajibabai n  & A. Hajbabaie n 

author keywords: Connected and automated vehicle; White phase; Mixed-autonomy traffic; Selfdriving vehicles
TL;DR: A novel mixed-integer non-linear program to control the trajectory of mixed connected-automated vehicles (CAVs) and connected human-driven vehicles (CHVs) through signalized intersections and reveals that a higher CAV market penetration rate induces more frequent white phase indication compared to green-red signals. (via Semantic Scholar)
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Sources: Web Of Science, NC State University Libraries, ORCID, Crossref
Added: June 29, 2020

2020 journal article

Utilization Management of Highway Operations Equipment

TRANSPORTATION RESEARCH RECORD, 2674(9), 202–215.

By: A. Mirheli  n, M. Tajalli n, R. Mohebifard n , L. Hajibabai n  & A. Hajbabaie n 

TL;DR: The numerical experiments reveal that the proposed framework can facilitate the utilization prediction and management of highway operations equipment and save up to 16.6% in operational costs considering different demand scenarios. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries, ORCID
Added: July 20, 2020

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