JUAN C MEDINA portrait
  • Research Assistant Professor, Civil And Environmental Engin

Publications

  • Hossain, Fahmid & Medina, Juan C. (2021). Verification of usRAP Risk Assessments for Run-Off and Head-On Crashes using Field Data. Transportation Research Board. Published, 01/2021.
    https://annualmeeting.mytrb.org/OnlineProgram/Deta...
  • Hossain, Fahmid & Medina, Juan C. (2020). Effects of Operating Speed and Traffic Flow on Severe and Fatal Crashes using the US Road Assessment Program Methodology and Field Data Verification. Transportation Research Record. Vol. 2674, 30-41. Published, 06/2020.
    https://journals.sagepub.com/doi/full/10.1177/0361...
  • Hossain, Fahmid & Medina, Juan C. (2020). Effects of Operating Speed and Traffic Flow on Severe and Fatal Crashes using the US Road Assessment Program Methodology and Field Data Verification. Transportation Research Board. Published, 01/2020.
    https://annualmeeting.mytrb.org/OnlineProgramArchi...
  • Matthew, J., Benekohal, R.F. & Medina, J.C. (2019). Accident Prediction Models using Macro and Micro Scale Analysis: Dynamic tree and Zero inflated negative binomial models with Empirical Bayes Accident History Adjustment. Report Number CTS 19-02. Roadway Safety Institute. Published, 02/2019.
    http://www.its.umn.edu/Publications/ResearchReport...
  • Hossain, F. & Medina, J. (2019). . Implications of Spatial Distribution of Crashes on the Safety Analysis of Closely-Spaced Entrance-Exit Ramps. Presented at the 98th Annual Meeting of the Transportation Research Board. Published, 01/2019.
  • Medina, J.C., Shea, M.S. & Azra, N. (2018). Safety Effects of Protected and Protected/Permissive Left-Turn Phases. Utah Department of Transportation - Report Number UT-19.04. Published, 12/2018.
    https://www.udot.utah.gov/main/uconowner.gf?n=6210...
  • Ullman, G.L., Pratt, M., Fontaine, M. D., Porter, R.J. & Medina, J.C. (2018). NCHRP Web-Only Document 240: Analysis of Work Zone Crash Characteristics and Countermeasures. Federal Highway Administration. Published, 02/2018.
    https://doi.org/10.17226/25006
  • Ullman, G.L., Pratt, M., Fontaine, M. D., Porter, R.J. & Medina, J.C. (2018). NCHRP Research Report 869: Estimating the Safety Effects of Work Zone Characteristics and Countermeasures – A Guidebook. Federal Highway Administration. Published, 01/2018.
    https://doi.org/10.17226/25007
  • Shea, M.S. & Juan Medina (2017). Approach-level Safety Comparison of Permissive-Protected and Protected Left Turn Phasing to Flashing Yellow Arrows. Presented at the 97th Annual Meeting of the Transportation Research Board. Published, 12/2017.
  • Nuzhat Azra & Juan Medina (2017). Exploration of a Lane-Specific Approach to Locate Intersection Crashes. Presented at the 97th Annual Meeting of the Transportation Research Board. Published, 12/2017.
  • Taylor, Jeffrey, Juan Medina & Richard J. Porter (2017). Driver Behavior near Urban Interchanges with Closely Spaced Ramps. TRB Circular - E-C229 - Presented at the Tenth SHRP 2 safety Data Symposium. Published, 10/2017.
  • Shea, M.S., Juan Medina & Richard J. Porter (2017). Safety Evaluation of Permitted Flashing Yellow Arrow Indications Considering Intersection Geometric Characteristics. Presented at the Urban Street Symposium 5 - Sponsored by TRB. Published, 05/2017.
  • Medina, J.C., Benekohal, R.F. Microwave Radar Vehicle Detection Performance at Railroad Grade Crossings with Quad Gates in Normal and Adverse Weather Conditions. Transportation Research Record, National Research Council, Washington, D.C., No. 2545, pp. 123-130, 2016. Published, 12/2016.
  • Mathew, J., Medina, J.C., Benekohal, R.F. Dynamic Tree Data Visualization Method for Grade Crossing Accidents. To be presented at the 14th Global Level Crossing and Trespass Prevention Symposium. Finland, June, 2016. Published, 06/2016.
  • Medina, J.C., Benekohal, R.F. Microwave Radar Vehicle Detection Performance at Railroad Grade Crossings with Quad Gates in Normal and Adverse Weather Conditions. Presented at the 95th Annual Meeting of the Transportation Research Board. Washington, D.C. January 2016. Published, 01/2016.
  • Medina, J.C., and Rahim F. Benekohal. Macroscopic models for accident prediction at railroad grade crossings: comparisons with US Department of Transportation accident prediction formula. Transportation Research Record: Journal of the Transportation Research Board 2476 (2015): 85-93. Published, 12/2015.
  • Medina, J.C., Benekohal, R.F. Vehicle Detection Design and the Performance of Congested Traffic Networks. Presented at the 18th International IEEE Annual Conference on Intelligent Transportation Systems. Canary Islands, Spain, 2015. Published, 09/2015.
  • Medina, J.C., Benekohal, R.F. Simple Feature-based Function Approximation for Reinforcement Learning Traffic Signals in Oversaturated Networks. Presented at the 94th Annual Meeting of the Transportation Research Board. Washington, D.C. 2015. Published, 01/2015.
  • Medina, J.C., Benekohal, R.F. Macroscopic Models for Accident Prediction at Railroad Grade Crossings and Comparisons with the U.S. DOT Accident Prediction Formula. Presented at the 94th Annual Meeting of the Transportation Research Board. Washington, D.C. 2015. Published, 01/2015.
  • Medina, J.C., Benekohal, R.F. Dual Microwave Radar Vehicle Detection System at Quad Gate Railroad Grade Crossing. Transportation Research Record, National Research Council, Washington, D.C., No. 2458, pp. 110-117, 2014. Published, 12/2014.
  • Medina, J.C., Lo, E.G., Benekohal, R.F. Multi-Attribute Decision Making Methods for Optimal Selection of Traffic Signal Control Parameters in Multimodal Analysis. Transportation Research Record, National Research Council, Washington, D.C., No. 2438, pp. 64-71, 2014. Published, 12/2014.
  • Medina, J.C., Ramezani, H., Benekohal, R.F. Evaluation of Microwave Radar Vehicle Detectors at Signalized Intersection under Adverse Weather Conditions. Transportation Research Record, National Research Council, Washington, D.C., No. 2356, pp. 100-108, 2013. Published, 12/2013.
  • Medina, J.C., Hajbabaie, A., Benekohal, R.F. Effects of Metered Entry Volume on an Oversaturated Network with Dynamic Signal Timing. Transportation Research Record, National Research Council, Washington, D.C., No. 2356, pp. 53-60, 2013. Published, 12/2013.
  • Medina, J.C., Avrenli, K., Benekohal, R.F. Field and Software Evaluation of Illuminance from LED Luminaires for Roadway Applications. Transportation Research Record, National Research Council, Washington, D.C., No. 2384, pp. 55-64, 2013. Published, 12/2013.
  • Medina, J.C., Hajbabaie, A., Benekohal, R.F. Detection Performance of Wireless Magnetometers at Signalized Intersection and Railroad Grade Crossing under Different Weather Conditions. Transportation Research Record, National Research Council, Washington, D.C., No. 2259, pp. 233-241, 2011. Published, 12/2011.
  • Hajbabaie, A., Medina, J.C., Wang M-H., Benekohal, R.F., Chitturi, M. Sustained and Halo Effects of Various Speed Reduction Treatments in Highway Work Zones. Transportation Research Record, National Research Council, Washington, D.C., No. 2265, pp. 118-128, 2011. Published, 12/2011.
  • Chitturi, M., Medina, J.C., Benekohal, R.F. Testbed for Evaluation of Vehicular Detection Systems. Journal of Advanced Transportation. Vol. 44, Issue 3, pp.123-133, 2010. Published, 12/2010.
  • Medina, J.C., Chitturi, M., Benekohal, R.F. Effects of Fog, Snow, and Rain on Video Detection Systems at Signalized Intersections. Transportation Letters, Vol. 2, Issue 1, pp. 13-25, 2010. Published, 12/2010.
  • Chitturi, M., Medina, J.C., Benekohal, R.F. Effects of Shadows and Time of Day on Performance of Video Detection Systems at Signalized Intersections. Transportation Research Part C: Emerging Technologies, Vol. 18, Issue 2, pp. 176-186, 2010. Published, 12/2010.
  • Chitturi, M., Benekohal, R.F., Hajbabaie, A., Wang M-H., Medina, J.C. Effectiveness of Automated Speed Enforcement in Work Zones. Journal of the Institute of Transportation Engineers. Vol. 80 (6). 2010. Published, 12/2010.
  • Medina, J.C., Benekohal, R.F, Hajbabaie, A., Wang, M.H., Chitturi, M. Downstream Effects of Speed Photo Enforcement and Other Speed Reduction Treatments on Work Zones. Transportation Research Record, National Research Council, Washington, D.C., No. 2107, pp. 24-33, 2009. Published, 12/2009.
  • Benekohal, R.F, Wang, M.H., Chitturi, M., Hajbabaie, A., Medina, J.C. Speed Photo-Radar Enforcement and Its Effects on Speeds in Work Zones. Transportation Research Record, National Research Council, Washington, D.C., No. 2096, pp. 89-97. 2009. Published, 12/2009.
  • Medina, J.C., Benekohal, R.F, Chitturi, M. Changes in Video Detection Performance at Signalized Intersections Over Different Illumination Conditions. Transportation Research Record, National Research Council, Washington, D.C., No. 2129, pp. 111-120, 2009. Published, 12/2009.
  • Benekohal, R.F., Chitturi, M., Hajbabaie, A., Wang, M.H., Medina, J.C. Automated Speed Photo Enforcement Effects on Speed in Work Zones. Transportation Research Record, National Research Council, Washington, D.C, No. 2055, pp. 11-20, 2008. Published, 12/2008.
  • Kang, S., Medina, J.C., Ouyang, Y. Optimal Operations of Transportation Fleet for Unloading Activities at Container Ports, Transportation Research Part B: Methodological, Vol 42, No 10, 2008. Published, 12/2008.

Research Keywords

  • Transportation Safety
  • Traffic Control Systems
  • Machine Learning/ Artifical Intelligence
  • Data Integration and Analytics

Presentations

  • Invited Panel Member. North Carolina eCrash Modernization Peer Exchange. Shared experience in development of UTAPS-CDI with other selected crash management programs led by university teams. Chapel Hill, NC. Invited Talk/Keynote, Presented, 02/2020.
  • Hossain, Fahmid, and Juan C. Medina. "Effects of operating speed and traffic flow on severe and fatal crashes using the US road assessment program methodology and field data verification." Presented at the 99th Annual Meeting of the Transportation Research Board. Conference Paper, Refereed, Presented, 01/2020.
    https://journals.sagepub.com/doi/full/10.1177/0361...
  • Four years ago, the Utah Crash Data Initiative (UTAPS-CDI) was started as a way to unify the management of crash records – improving efficiency and data access. UTAPS-CDI is a partnership between the Departments of Transportation and Public Safety with the University of Utah. The initiative developed a content management system built on open source tools, where users conduct data quality control, geo-locate crashes, generate reports, and analyze the data using SQL queries, spatial filters, and free text searches through intuitive interfaces. UTAPS-CDI now also integrates data from EMS, the commercial motor vehicle group at the DOT, and the Utah Highway Patrol, expanding the reach of the initiative with a common goal: improve traffic safety. Invited Talk/Keynote, Presented, 08/05/2019.
    https://trafficrecordsforum.org/timetable/event/th...
  • Hossain, F. & Medina, J. (2019). . Implications of Spatial Distribution of Crashes on the Safety Analysis of Closely-Spaced Entrance-Exit Ramps. Presented at the 98th Annual Meeting of the Transportation Research Board. Conference Paper, Refereed, Presented, 01/16/2019.

Languages

  • Spanish, fluent.

Geographical Regions of Interest

  • Colombia
    ITS implementations, data collection, sensor evaluation, big data applications to transportation.
  • Latin America and the Caribbean
    ITS implementations, data collection, sensor evaluation, big data applications to transportation.