Larson Institute Transportation Operations Program Safety Research Paul P Jovanis Professor Emeritus Eric Donnell Associate Professor

Larson Institute interests lie in analysis of safety challenges Road Safety Analysis – fundamental analysis challenges –State-level crash and roadway inventory data –Study-specific operations data (e.g. speed), especially related to geometric elements or safety problems –NDS data, including those beyond SHRP 2 Human factors studies on test track and simulators

Program possesses breadth and depth in road safety research Significant activity by multiple faculty in application of statistical methods to road safety FHWA, NCHRP, PennDOT, WashDOT, NYCDOT among sponsors Research started in early 2000’s prior to advent of Highway Safety Manual Research Program

Active research team includes: Eric Donnell Vikash Gayah Paul Jovanis Martin Pietrucha Venky Shankar Philip Garvey Numerous graduate students Frank GrossVHB Associates RJ PorterUniversity of Utah Ken WuNCTU Taiwan Jonathan Aguero-ValverdeUniversity of Costa Rica Scott HimesVHB Associates Wen HuIIHS

Sub-specialty: Road Safety Analysis Pioneering research on application of count regression to road safety (Jovanis, Shankar) Crashes on roads a fundamental spatial phenomenon, yet rarely take advantage of this attribute in safety analysis (Donnell, Hu, Jovanis, Aguero-Valverde) Identification and use of comparison site data in evaluation of safety countermeasure effectiveness (Gross, Jovanis, Donnell, Sasidharan)

Numerous studies support Highway Safety Manual development and use Development of crash modification factors for specific treatments - Donnell Develop methods for crash modification factor estimation – Jovanis, Donnell Developing Safety Performance Functions – Donnell, Gayah, Jovanis Simultaneous modeling of crash frequency and severity – Jovanis and Aguero

Several studies at interface of safety, operations and design Development of a Crash Modification Factor for Application of Safety Edge SM on Two-lane Rural Highways – Donnell Entry Control Facility Geometric Criteria – Donnell, Brennan Safety Evaluation of Continuous Green-T Intersection – Donnell Reducing Roadway Departure Crashes at Horizontal Curve Sections on Two-lane Rural Highways - Donnell

Driver visual perception is an area of active research Evaluating the Clearview Typeface System for Negative Contrast Signs - Garvey and Pietrucha The Development of Optimal On-premise Electronic Message Center (EMC) Lighting Levels and Sign Lighting Measurement Techniques – Garvey and Pietrucha Modeling the Dynamics of Driver’s Dilemma Zone Perception using Machine Learning Methods for Safer Intersection Control - Garvey

Naturalistic driving study (NDS) data analysis is a strength Methodological paradigms in NDS– Shankar and Jovanis Effects of omitted variable bias on crash analysis with NDS – Wu, Aguero, Jovanis and Shankar Relationship between crashes and near crashes – Wu and Jovanis Screening Naturalistic Driving Study Data – Wu and Jovanis NDS SHRP 2 Central PA. data collection site – Jovanis, Rado, many others

But life is not as simple as it seems...

Larson Institute interests lie in analysis of safety challenges Road Safety Analysis – fundamental analysis challenges –State-level crash- spatial correlation; identification of comparison groups –Study-specific operations data (e.g. speed), especially related to geometric elements or safety problems –NDS data, including those beyond SHRP 2 Human factors studies on test track and simulators

Thank You!! Contact Information Paul Jovanis Eric Donnell