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The followings present a summary of my experiences in the field of Transportation Engineering; Also copy of my curriculum vitae can be found here (Updated May 2018).
Traffic Safety Engineer @ Arkansas State Highway and Transportation Department
August 2014 – Present
Longitudinal Crash Frequency Analysis
February 2012 – June 2014
Developed several longitudinal crash frequency models including traditional negative binomial models
Evaluated the Missouri's Strategic Highway Safety Plan (MSHSP) - Missouri's Blueprint for Safer Roadways (Here)
Proposed an alternative simple approach to investigate the effectiveness of a roadway interventions (Here)
Investigated the effect of temporal correlation in developing safety performance functions
Developed a negative binomial model using generalized estimating equations technique (Here)
Effects of Road Construction Intensity on Rural Freeway Work Zone Capacity
May 2012 – July 2014
Reviewed the research literature on work zone capacity practices,
Collected about 20 hours of video data from two different work zones on Route 63 at Rolla and I-44 highway at Eureka Missouri,
Extracted and manipulated the data recorded by the ASTI sensors in the work zone area, and
Calculated the work zone capacity values using the following methodologies in MATLAB:
Queue discharge flow utilizing chapter 25 of Highway Capacity Manual (HCM) 2010,
Three-regime speed-flow relationship, using an iterative procedure by changing the critical density, and
Various definitions of break-down flow rates.
Here is a direct link to the Project Report published by the Mid-America Transportation Center.
Influencing Work Zone Traffic Flow through Variable Messaging Technologies
August 2011 – May 2012
Reviewed the research literature in the area of variable (dynamic) message signs,
Prepared the given sensor speed data and DMS message data using SAS and MATLAB for analysis,
Prepared a survey for the US highway agencies regarding their experience with Dynamic Message Signs (DMS) /Portable Changeable Message Signs (PCMS) especially in work zones, and
Cooperating in setting up the driving simulator for the virtual reality work zone driving tests.
A copy of the Final Report of this project can be accessed through the website of the Institute of Transportation at Iowa State University.
Effects of Variable Speed Limit System on Travel Time Reliability
January 2011 – July 2011
Reviewed the literature in the area of travel time reliability and measures of effectiveness,
Determined the following metrics including travel time (mean, standard deviation, 85th percentile), travel time index (TTI), buffer time index (BTI), planning time index (PTI), skew and width statistic for the travel time distribution, failure rate, and misery index (MI), and
Evaluated the effects of VSL system on travel time reliability measures over 9 months on various roadway sections.
Here is a direct link to the Project Report prepared for the Missouri Department of Transportation.
August 2009 – December 2010
Reviewed the research literature in area of work zone speed limit,
Collected more than 50 hours of video data from five different work zones on I-44 highway,
Conducted a questionnaire survey to subjectively assess drivers’ perception of work zones,
Extracted volume, speed and headway data using Autoscope video processing software,
Evaluated the field data objectively,
Evaluated the survey data subjectively, and
Recommended actions to improve work zone speed limit compliance and safety.
Here is a direct link to the Project Report published by the Mid-America Transportation Center.
The results of this analysis was also presented at the 90th TRB annual meeting and an ASCE conference that can be found here and here, respectively.
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