1. Liu, J. (PI), Xu, N., Pena-Bastidas, J., Hainen, A., & Qian, X., 2025. Managing the Traffic Impacts of Highway Infrastructure Constructions: A Framework for Construction planning. Submitted to Alabama Department of Transportation, 2025.

  2. Liu, J. (PI), Xu, N., Penmetsa, P., Barnett, T., Pate, J., and Jones, S., 2024. Developing a Near-Miss Reporting System for Roadside Responders (Technical Report). Washington, D.C.: AAA Foundation for Traffic Safety. https://aaafoundation.org/developing-a-near-miss-reporting-system-for-roadside-responders-report/

  3. Liu, J. (PI), Zhang Z., Hainen, A., Jones, S., Barnett, T., and Burdette, S., 2024. Proactive Traffic Incident Management in Alabama. Submitted to Alabama Department of Transportation, 2024. https://rosap.ntl.bts.gov/view/dot/78177/dot_78177_DS1.pdf

  4. Liu, J. (PI), Penmetsa, P., Yang, C., Hainen, A. & Barnett, T. 2023. Protecting Roadside Workers: Field Evaluation of a Vehicle-Mounted Variable Message Sign and Examination of Worker Perceptions and Use of Countermeasures (Technical Report). Washington, D.C.: AAA Foundation for Traffic Safety. https://aaafoundation.org/protecting-roadside-workers-field-evaluation-of-a-vehicle-mounted-variable-message-sign-and-examination-of-worker-perceptions-and-use-of-countermeasures/

  5. Liu, J. (PI), & S. Jones. 2023. Development of Alabama-specific Safety Performance Functions for Intersections. Submitted to Alabama Department of Transportation, 2023.

  6. Liu, J. (PI), P. Penmetsa, X. Li., & T. Barnett. 2020. Safety Performance of Rural Four-Lane Undivided Roadways and Rural Four-Lane Roadways with a Two-Way Left-Turn Lane. FHWA-GA-21-1915. Submitted to Georgia Department of Transportation, 2020. https://rosap.ntl.bts.gov/view/dot/58009

  7. Liu, J. (PI), & S. Jones. 2020. Crash Modification Factor Guidance for Highway Safety Improvement Program in Alabama. Submitted to Alabama Department of Transportation, 2020.

  8. Liu, J. (PI), & S. Jones. 2020. Development of Alabama-specific Safety Performance Functions for Intersections - Part I: Unsignalized Intersections. Submitted to Alabama Department of Transportation, 2020.

  9. Liu, J. (Co-PI), et al., 2020. Chapter 4 and 5 of I-10 Mobile River Bridge: A Macroscopic Study of No-Build Implications. Submitted to Alabama Department of Transportation, 2020.

  10. Liu, J. (PI), et al., 2020. A Cost-Benefit Analysis of Widening AL-167: A Macroscopic Study. Submitted to Wiregrass Economic Development Corporation Enterprise, Alabama. 2020

  11. Liu, J., A. Nichols & K. Kockelman. Chapter 8 of Bringing Smart Transport to Texans: Ensuring the Benefits of a Connected and Autonomous Transport System in Texas (No. FHWA/TX-16/0-6838-2). Submitted to Texas Department of Transportation, 2016.

  12. Kockelman, K., L. Loftus-Otway, D. Stewart, A. Nichols, W. Wagner, J. Li, S. Boyles, M. Levin & J. Liu. Best Practices Guidebook for Preparing Texas for Connected and Automated Vehicles (No. 0-6849-P1). TxDOT Project 0-6849: Implications of Automated Vehicles on Safety, Design and Operation of the Texas Highway System. Submitted to Texas Department of Transportation, 2016.

  13. Kockelman, K., L. Loftus-Otway, D. Stewart, A. Nichols, W. Wagner, S. Boyles, M. Levin, , J. Liu, K. Perrine, S. Kilgore & K.M. Gurumurthy. Best Practices for Modifying Transportation Design, Planning, and Project Evaluation in Texas (No. 0-6847-P1). TxDOT Project 0-6847: An Assessment of Autonomous Vehicles: Traffic Impacts and Infrastructure Needs. Submitted to Texas Department of Transportation, 2017.

  14. Khattak, A., J. Liu, & B. Wali, Highway Safety Manual: Spatial Heterogeneity, Transferability, Non-Linearities in Safety Performance Functions. Submitted to Southeastern Transportation Center (Sponsored by US Department of Transportation), 2016.

  15. Khattak, A., J. Liu, B. Wali, M. Kamrani & M. Zhang, Big Data Generated by Connected and Automated Vehicles for Safety Monitoring, Assessment and Improvement. Submitted to Southeastern Transportation Center (Sponsored by US Department of Transportation), 2016.

  16. Greene, D., A. Khattak, J. Liu, J. Hopson, X. Wang & R. Goeltz. How Do Motorists' Own Fuel Economy Estimates Compare with Official Government Ratings? A Statistical Analysis. Submitted to Oak Ridge National Laboratory, 2015.

  17. Khattak, A., J. Liu, & X. Wang. Big Data for Safety Monitoring, Assessment and Improvement. Submitted to Southeastern Transportation Center (Sponsored by US Department of Transportation), 2015.

  18. Khattak, A., J. Liu & M. Zhang. Highway Safety Manual: Enhancing the Work Zone Analysis Procedure. Submitted to Southeastern Transportation Center (Sponsored by US Department of Transportation), 2015.

  19. Khattak, A., J. Liu, X. Wang & M. Zhang, What Is the Extent of Harm in Railroad Crashes? Submitted to National University Rail Center (Sponsored by US Department of Transportation), 2015

  20. Khattak A., X. Wang, J. Liu, J. Bandeira & S. Son. Reducing Energy Use and Emissions through Innovative Technologies and Community Designs. Submitted to Transportation for Livability by Integrating Vehicles and the Environment (Sponsored by US Department of Transportation), 2015.

  21. Khattak A., X. Wang, S. Son, & J. Liu. Data Needs Assessment for Making Transportation Decisions in Virginia. Submitted to Virginia Department of Transportation, Richmond, VA, 2014.