Research Interests

Research Interests

Work zone safety, rural road safety, human factors, driver behavior and distraction. Transportation data reduction, integration and analysis. Data visualization and big data analysis using statistical software R. Time series analysis, statistical model performance analysis, crash data analysis, calculation of CMFs and SPFs, cross sectional and empirical Bayes before after analysis and utilization of Geographic Information Systems (GIS).

Projects

• Evaluation of Work-Zone Safety Using SHRP2 Naturalistic Driving Study Data. Phase II. Sponsor: AASHTO and Minnesota DOT.

 Identified work zones from RID data: Used data mining and dynamic segmentation in ArcGIS

 Reduced driver forward videos for useful work zone characteristics, lane merge details, etc. Trained other research assistants with data collection process.

 Integrated driver speed, glance, distraction and work zones characteristics using statistical software R.

 Analyzed driver’s speed change and lane merge behaviors in work zones using Linear mixed effect models.

 Major role in project design, planning, procedures, quality assurance and quality control, delivery.

 Prepared literature review, report and publishable paper.

• Evaluating the relationship between the driver and roadway to address rural intersection safety using the SHRP2 naturalistic driving study data

 Reduced driver forward videos for reducing useful rural intersection characteristics

• Safety Evaluation of Beacons on Stop Sign. Sponsor: Iowa DOT

 Used GIMS and crash data from Iowa DOT

 Found control intersections using propensity score matching

 Cross sectional safety analysis

 Prepared literature review, report and publishable paper.

• Development of Crash Modification Factors for Curve Chevrons. Sponsor: Iowa DOT

 Data collected and manipulated using Advanced Excel

 Cross sectional safety analysis in Nlogit5/limdep

 Prepared report.

• Development of Crash Modification Factors for Safety Edge. Sponsor: Iowa DOT

 Detailed data collection process from Iowa DOT construction plans.

 Selected control segments and integrated various databases together using ArcGIS

 Performed empirical Bayes before and after analysis in R.

 Assisted with hierarchical full Bayes analysis in R.

 Prepared report and publishable papers.

• Identification of Risk Factors for Horizontal Curves in Iowa. Sponsor: Iowa DOT

 Extracted location and characteristics of curves using ArcGIS

 Integrated roadway, traffic and crash data with curves

 Evaluated risk factors for horizontal curves on freeways and non-freeways using negative binomial models

 Prepared literature review, report and publishable paper.

• Safety Evaluation of Sequential Dynamic Chevrons. Sponsor: Iowa DOT

 Visualized, integrated and manipulated database in R.

 Performed empirical Bayes before and after safety analysis adjusted for time trends.

 Prepared literature review and publishable paper.

• Road Diet: Analysis of Bike and Pedestrian Crashes. Sponsor: LEIDOS

 Safety Performance functions using SPSS.

 Empirical Bayes before after safety analysis.

 Case-control study.

 Reported results.