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Traffic Safety


Pedestrians are some of the most vulnerable road users as they are not protected by safety devices, and must also share the road with vehicles traveling at dangerous speeds, particularly during road crossings.  In 2011, the State of Oregon changed their traffic laws to be more accommodating to pedestrians by giving right of way to pedestrians using a crosswalk, regardless of whether the crosswalk is marked or unmarked.  This paper estimates a panel logit model to evaluate the efficacy of the law in preventing pedestrian fatalities.  Pedestrian fatalities are shown to decrease over time, with smaller likelihood of fatality outcome in the years following the change in pedestrian crossing laws.  To the authors' knowledge, it is the first time panel logit models have been used in evaluating pedestrian safety.  Results indicate that panel logit models are an alternative to using Box-Tiao intervention models to analyze the long term effects of policy changes, as they allow for the consideration of crash exposure factors as well as temporal effects.

Completed 2016


Iowa State Safety Work

Prior to her arrival at Purdue University, Dr. Nadia Gkritza (our faculty) was an Assistant Professor at Iowa State University.  The research projects listed here were completed by Dr. Gkritza, and her former colleagues and students at the Institute for Transportation (InTrans) at Iowa State.

Statewide Heavy-Truck Crash Assessment - Sep, 2014

Improving Traffic Safety Culture in Iowa - Phase II - Jul, 2013

Study of the Factors that Contribute to Motorcycle Conspicuity - Phase II - May, 2012

A Transportation Safety Planning Tool for the City of Ames - Aug, 2011

Applicability of Road Assessment Program Methods to Metropolitan Safety Planning - Aug, 2011

Asset Management and Safety: A Performance Perspective - Mar, 2011

Improving Traffic Safety Culture in Iowa - Oct, 2010

Enhancing Motorcycle Conspicuity Awareness in Iowa - Jun, 2010

Infrastructure Impacts of Iowa's Changing Economy (TR-593) - Jan, 2010

Evaluation of the Iowa Driver Improvement Program - Jul, 2009

Effectiveness of Special Deer Management Hunts on Deer-Vehicle Crash Reduction - Jun, 2009