Justice Appiah, Ph.D., P.E.
Associate Principal Research Scientist
Research Interests:
- Traffic modeling and simulation
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Traffic engineering and traffic control devices
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Highway safety analysis
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Traffic signal operations
Education:
- Ph.D., Civil Engineering, University of Nebraska-Lincoln
- M.S., Civil Engineering, Texas A&M University, College Station
- B.Sc., Kwame Nkrumah Univ. of Sci. & Tech, Kumasi, Ghana
Registrations:
- Registered Professional Engineer, Commonwealth of Virginia
- Registered Professional Engineer, State of Michigan
Memberships:
- Institute of Transportation Engineers
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Standing Committee on Traffic Control Devices (AHB50), Transportation Research Board
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Advanced Technologies Committee, ASCE Transportation and Development Institute
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Transportation Statistics Interest Group, American Statistical Association
Awards:
- VTRC Jack H. Dillard Best Paper Award, "Examination of Features Correlated with Roadway Departure Crashes on Rural Roads" (with M. Zhao), 2021
- Best Paper Award for “Safety Effects of Flashing Yellow Arrows Used in Protected Permitted Phasing: Comparison of Full Bayes and Empirical Bayes Results", (with King, Fontaine, and Cottrell), TRB Committee AHB50 (Traffic Control Devices), 2018
- VTRC Horizon Award for Significant Impact on the State of Practice in Transportation, 2016
- International Road Federation Fellow, 2009
- Charley V. Wootan Award for “Outstanding MS Thesis in Transportation Policy and Planning,” Council of University Transportation Centers, Washington DC, 2005
Current Projects
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  Improving Holiday Congestion Forecasting on Interstate HighwaysProject No: 127961
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  Analyzing and Predicting Truck Travel Time ReliabilityProject No: 125968
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  Intersection Safety Performance Function Calibration Factors for Project Planning and DesignProject No: 124329
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  Calibration of Safety Performance Functions for Freeway Ramp Terminals in VirginiaProject No: 119593
Reports
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  A Benefit-Cost Analysis Tool for Assessing Guardrail Needs for Two-Lane Rural Roads in VirginiaReport No: 16-R5
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  Safety and Operations Guidance for Using Time-of-Day Protected-Permissive Left-Turn Phasing Using Flashing Yellow ArrowsReport No: 19-R10
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  Examination of Features Correlated With Roadway Departure Crashes on Rural RoadsReport No: 21-R2
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  Methods to Analyze and Predict Interstate Travel Time ReliabilityReport No: 22-R2
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  Methodology for Calibration and Validation of Mesoscopic Traffic Simulation ModelsReport No: 22-R7
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  Prediction of Interstate Travel Time Reliability: Phase IIReport No: 23-R12
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  Calibration of Highway Safety Manual Safety Performance Functions for Freeway Ramp Terminals in VirginiaReport No: 23-R17
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  Evaluation of Post-Mounted Delineators and Curve Warning Message Markings Phase 1: Designing a Sampling PlanReport No: 25-R20
Team Membership
Last updated: July 3, 2025
