Center for Injury Research and Prevention

Car Crash Research: Developing the New Jersey Traffic Safety Outcomes Data Warehouse

CIRP Car Accident Research to Increase GDL Compliance
CIRP researchers developed and utilized the NJ-TSO
Data Warehouse to study GDL compliance.

This line of car crash research at CIRP aims to advance traffic safety research and associated epidemiologic methods through novel administrative data linkages. Led by Allison E. Curry, PhD, MPH, the research team developed a comprehensive data warehouse that includes the full licensing, citation, and crash history of every New Jersey driver between 2004 and 2014.

To provide further information about these NJ residents and drivers, we also linked zip-code level indicators from the Census and electronic health records for 150,000 pediatric patients of the CHOP Healthcare Network. We are also currently in the process of linking statewide birth certificate data, death certificate data, and hospital and emergency department discharge data.

The New Jersey Traffic Safety Outcomes (NJ-TSO) Data Warehouse allows us to fill numerous important gaps in car crash research. Crash reports contain data only on the events occurring just prior to the crash, the crash event itself, and the immediate conditions of those involved in the crash. While helpful, this information only covers a few minutes in the lifespan of a crash. The NJ-TSO Data Warehouse provides us with the ability to increase the study period from minutes to potentially decades. With these data, we can better study the effects of car crashes and to develop evidence-based tactics to prevent them.

Research Utilizing the New Jersey Traffic Safety Outcomes Data Warehouse

  • Effect of New Jersey's Graduated Driver Licensing Decal Provision On Young Intermediate Drivers -- New Jersey has one of the most progressive GDL systems in the country; but without this research, the state would not have known empirically that its robust program reduces young driver crashes. Read more about the research.
  • Young Drivers’ Licensing and Crash Patterns --  Previous nationally representative surveys have described important reasons why teens delay getting a driver’s license but have been unable to estimate population-level licensure rates and trends. Findings indicate that age and experience matter when it comes to young driver crash rates and support extending age requirements for the intermediate phase of GDL to 21. Read more about the research here and here.
  • Establishing the Scientific Foundation for Driving with Developmental Disabilities -- Researchers are conducting rigorous research on adolescents with developmental disabilities to provide the evidence base needed to inform the development of tailored medical, behavioral, and technological interventions to address the unique needs of adolescents with autism spectrum disorder (ASD) and attention-deficit hyperactivity disorder (ADHD) to prepare them for safe, independent driving. Read more about the research.
  • Compliance With and Enforcement of Graduated Driver Licensing Provisions -- Researchers used a novel application of the quasi-induced exposure technique, a method that has been developed to estimate driving exposure in the absence of more detailed information, to determine rates of compliance with two GDL provisions—passenger limits and nighttime driving. Read more about the research.
  • Population-based Driver Licensing and Crash Rates Among Older Adults -- Researchers are conducting the first longitudinal analyses of older adults’ rates of driver licensure and adverse driving outcomes, an important source of morbidity and mortality among older adults in the US.