Research

Research Interests

• Application of statistics and econometric methods in transportation data analysis

• Transportation safety

• Emerging transportation technologies (Urban Air Mobility, Connected and Self-driving vehicles)

• Travel behavior

Recently Published Articles

1. David, D., Ahmed, S. S., Sarwar, M. T., Fountas, G., & Anastasopoulos, P. C. (2023). An In-Depth Econometric Analysis of Pavement Performance and Service Life by Pavement Rehabilitation Treatment Type and Delivery Method. Journal of Infrastructure Systems, 29(4), 04023024. doi: https://doi.org/10.1061/JITSE4.ISENG-2203 

2. Ahmed, S. S., Fountas, G., Anastasopoulos, P. C., & Peeta, S. (2023). Analysis of urban travel time and travel distance: A fully parametric bivariate hazard-based duration modelling approach with correlated grouped random parameters. Travel Behaviour and Society, 31, 271-283. doi: https://doi.org/10.1016/j.tbs.2022.12.004 

3. Ahmed, S. S., Corman, F., & Anastasopoulos, P. C., 2023. Accounting for unobserved heterogeneity and spatial instability in the analysis of crash injury-severity at highway-rail grade crossings: A random parameters with heterogeneity in the means and variances approach. Analytic Methods in Accident Research, 37, 100250. doi: https://doi.org/10.1016/j.amar.2022.100250 

4. Ahmed, S. S., Alnawmasi, N., Anastasopoulos, P. C., & Mannering, F. (2022). The effect of higher speed limits on crash-injury severity rates: A correlated random parameters bivariate tobit approach. Analytic Methods in Accident Research, 34, 100213. doi: https://doi.org/10.1016/j.amar.2022.100213

5. Pang, J., Krathaus, A., Benedyk, I., Ahmed, S. S., & Anastasopoulos, P. C. (2022). A temporal instability analysis of environmental factors affecting accident occurrences during snow events: The random parameters hazard-based duration model with means and variances heterogeneity. Analytic Methods in Accident Research, 34, 100215. doi: https://doi.org/10.1016/j.amar.2022.100215

6. Eker, U., Fountas, G., Ahmed, S. S., & Anastasopoulos, P. C. (2022). Survey Data on Public Perceptions Towards Flying Cars and Flying Taxi Services. Data in Brief, 41, 10798. doi: https://doi.org/10.1016/j.dib.2022.107981 

7. Ahmed, S. S., Fountas, G., Eker, U., & Anastasopoulos, P. C. (2022). Are We Willing to Relocate with the Future Introduction of Flying Cars? An Exploratory Empirical Analysis of Public Perceptions in the United States. Transportmetrica A: Transport Science, 18(3), 1025-1052. doi:  https://doi.org/10.1080/23249935.2021.1916643

8. Ahmed, S. S., Cohen, J., & Anastasopoulos, P. C. (2021). A correlated random parameters with heterogeneity in means approach of deer-vehicle collisions and resulting injury-severities. Analytic Methods in Accident Research, 30, 100160. doi: https://doi.org/10.1016/j.amar.2021.100160 

9. Ahmed, S. S., Fountas, G., Eker, U., Still, S. E., & Anastasopoulos, P. C. (2021). An exploratory empirical analysis of willingness to hire and pay for flying taxis and shared flying car services. Journal of Air Transport Management, 90, 101963. doi: https://doi.org/10.1016/j.jairtraman.2020.101963

10. Pantangi, S. S., Ahmed, S. S., Fountas, G., Majka, K., & Ch. Anastasopoulos, P. C.(2020). Do High Visibility Crosswalks Improve Pedestrian Safety? A Correlated Grouped Random Parameters Approach Using Naturalistic Driving Study Data. Analytic Methods in Accident Research, 30,  100155. doi: https://doi.org/10.1016/j.amar.2020.100155 

11. Ahmed, S. S., Pantangi, S. S., Eker, U., Fountas, G., Still, S. E., & Anastasopoulos, P. C. (2020). Analysis of Safety Benefits and Security Concerns from the Use of Autonomous Vehicles: A Grouped Random Parameters Bivariate Probit Approach with Heterogeneity in Means. Analytic Methods in Accident Research, 28, 100134. doi: https://doi.org/10.1016/j.amar.2020.100134 

12. Ahmed, S. S., Hulme, K., Fountas, G., Eker, U., Benedyk, I., Still, S. E., & Anastasopoulos, P. C. (2020). The Flying Car–Challenges and Strategies towards Future Adoption. Frontiers in Built Environment, 6, 106. doi: https://doi.org/10.3389/fbuil.2020.00106 

13. Eker, U., Ahmed, S. S., Fountas, G., & Anastasopoulos, P. C. (2019). An exploratory investigation of public perceptions towards safety and security from the future use of flying cars in the United States. Analytic Methods in Accident Research, 23, 100103. doi: https://doi.org/10.1016/j.amar.2019.100103 

14. Ahmed, S. S., & Ahmed, S. S. (2019). Finite Element Modeling of Axial-Vertical Interaction Behavior of Buried Pipelines in Dense Sand. International Journal of Offshore and Polar Engineering, 29(01), 70-77. doi: https://doi.org/10.17736/ijope.2019.bn15 

15. Ahmed, S. S., Hossain, N., Khan, A.J. & Islam, M.S. (2016). Prediction of Soaked CBR using Index Properties, Dry Density and Unsoaked CBR of Lean Clay. Malaysian Journal of Civil Engineering, 28(2). URL: https://journals.utm.my/mjce/article/view/15975  

Conference Proceedings

1. Ahmed, S. S., Corman, F., Anastasopoulos, P., 2023. Addressing unobserved heterogeneity and spatial instability in the analysis of highway-rail grade crossing crashes: A random parameters with heterogeneity in means and variances approach. 102nd Transportation Research Board Annual Meeting, Washington D.C., 1/8-12, 2023. 

2. Mahmood, K., Pang, J., Ahmed, S. S., Yu, G., Sarwar, M. T., Benedyk, I., Anastasopoulos, P., 2023. Lessons Learned from Naturalistic Driving Data Processing in a Secure Data Enclave: Preliminary Discoveries from Analyzing Dash Camera Videos. 102nd Transportation Research Board Annual Meeting, Washington D.C., 1/8-12, 2023. 

3. Ahmed, S. S., Majka, K., Pierowicz, J., Blatt, A., Anastasopoulos, P., Pantangi, S., Eker, U., Fountas, G., 2022.  Phase 2 - High Visibility Crosswalk Pedestrian Study: Concept to Countermeasure – Research to Deployment Using the SHRP2 Safety Data. 101st Transportation Research Board Annual Meeting, Washington D.C., 1/9-13, 2022. 

4. Pang, J., Krathaus, A., Benedyk, I., Ahmed, S. S., Anastasopoulos, P., 2022.  Investigation of Environmental Factors Affecting Accidents Occurrence During Snow Events: A Random Parameters Hazard-Based Duration Modeling Approach with Heterogeneity in Means and Variances. 101st Transportation Research Board Annual Meeting, Washington D.C., 1/9-13, 2022. Best paper award, given by the TRB Committee on Statistical Methods (AED60). 

5. Hulme, K., Lim., R., Benedyk, I., Still, S., Anastasopoulos, P., Ahmed, S. S., Fountas, G., 2021. Advanced Air Mobility (AAM) – Innovating Modeling & Simulation (M&S) to Revolutionize the Future of Transportation. Interservice/Industry Training, Simulation and Education Conference (I/ITSEC) Innovating and Accelerating Training: Adapting to an Unexpected Future!, Orlando, FL, 11/29-12/3, 2021. Best Tutorial Award.

6. Ahmed, S. S., Fountas, G., Eker, U., Still, S., Anastasopoulos, P., 2021. An exploratory empirical analysis of public willingness to hire and pay for flying taxis and shared flying car services. 100th Transportation Research Board Annual Meeting, Virtual Event, January 2021.

7. Ahmed, S. S., Cohen, J., Anastasopoulos, P., 2021. An exploratory analysis of factors causing deer-vehicle collisions: A case study in Pennsylvania. 100th Transportation Research Board Annual Meeting, Virtual Event, January 2021. Best paper award, given by the TRB Committee on Statistical Methods (AED60). 

8. Hulme, K., Anastasopoulos, P., Still, S., Lim, R., Ahmed, S. S., Benedyk, I., Pantangi, S.S., Fountas, G., Smolinski, G., 2020. The future of motorized and autonomous mobility (is now): Modeling & Simulation (M&S) requirements for flying cars. 2020 Interservice/Industry Training, Simulation & Education Conference, Orlando, FL, 11/20- 12/4, 2020.

9. Ahmed, S. S., Fountas, G., Anastasopoulos, P., 2020. Simultaneous modeling of travel time and distance: A bivariate hazard-based approach with correlated grouped random parameters. 99th Transportation Research Board Annual Meeting, Washington, D.C., 1/11- 17, 2020.

10. Hulme, K., Anastasopoulos, P., Still, S., Pantangi, S.S., Eker, U., Ahmed, S. S., Fountas, G., 2019. The flying car – Emergent modeling and simulation (M&S) policies and standards concerns. 2019 Interservice/Industry Training, Simulation & Education Conference, Orlando, FL, 12/2-6, 2019.

11. Eker, U., Ahmed, S.S., Fountas, G., Still, S. E., Anastasopoulos, P., 2019. How safe and secure will flying cars be? An empirical exploratory analysis of public perceptions in the United States. 2019 Defense TechConnect Innovation Summit & Expo, National Harbor, MD, 10/8-10, 2019.

12. Ahmed, S. S., Fountas, G., Anastasopoulos, P., 2019. Accounting for cross-equation error correlation and unobserved heterogeneity in a bivariate hazard-based duration modeling framework. 13th Annual International Conference on Mathematics & Statistics: Teaching, Theory & Applications, ATINER, Athens, Greece, 7/1-4, 2019.

13. Eker, U., Ahmed, S. S., Fountas, G., Still, S., Anastasopoulos, P., 2019. Will flying cars be safe and secure: An exploratory empirical analysis of public perceptions. 13th Annual International Conference on Mathematics & Statistics: Teaching, Theory & Applications, ATINER, Athens, Greece, 7/1-4, 2019.

14. Ahmed, S. S., Pantangi, S.S., Eker, U., Fountas, G., Still, S., Anastasopoulos, P., 2019. Public willingness to use autonomous vehicles and flying cars for airport access trips. 15th Annual International Conference on Tourism, ATINER, Athens, Greece, 6/10-13, 2019.

15. Pantangi, S.S., Ahmed, S. S., Eker, U., Fountas, G., Still, S., Anastasopoulos, P., 2019. Public perceptions on safety benefits and security concerns from the future use of autonomous and connected vehicles. 5th Annual International Conference on Transportation, ATINER, Athens, Greece, 6/3-6, 2019.

16. Ahmed, S. S., Fountas, G., Eker, U., Still, S., Anastasopoulos, P., 2019. An empirical exploratory analysis of potential residence relocation trends from the future introduction of flying cars. 5th Annual International Conference on Transportation, ATINER, Athens, Greece, 6/3-6, 2019.

Research Projects and Reports

1. An In-Depth Investigation of the Efficacy of High Visibility Crosswalks (HVC) by Regional Difference, Location and Configuration Using SHRP2 NDS Data to Improve Pedestrian Safety. Sponsor: Federal Highway Administration (K. Mahmood, S. S. Ahmed, J. Pang, P. Anastasopoulos). Report under preparation. 

2. Phase 2 – High Visibility Crosswalk Pedestrian Study: Concept to Countermeasure–Research to Deployment Using the SHRP2 Safety Data. Sponsor: New York State Department of Transportation (K. Majka, J. Pierowicz, A. Blatt, P. Anastasopoulos, S. Pantangi, U. Eker, G. Fountas, S. S. Ahmed), 2020. URL: https://rosap.ntl.bts.gov/view/dot/53990 

3. Factors affecting perceived and observed aggressive driving behavior: An empirical analysis of driver fatigue, and distracted driving. Sponsor: Transportation Informatics Tier I University Transportation Center, USDOT (G. Fountas, S. Pantangi, S. S. Ahmed, U. Eker and P. Anastasopoulos), 2019. URL: https://trid.trb.org/View/1592079