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TEENAGE DRIVER CRASHES -- CARRYING PASSENGERS AS A RISK FACTOR Li-Hui Chen, MS, Ph.D. Assistant Scientist Johns Hopkins School of Public Health Center for Injury Research & Policy Readings Carrying passengers as a risk factor for crashes fatal to 16- and 17-year-old drivers

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teenage driver crashes carrying passengers as a risk factor
TEENAGE DRIVER CRASHES -- CARRYING PASSENGERS AS A RISK FACTOR

Li-Hui Chen, MS, Ph.D.

Assistant Scientist

JohnsHopkins School of Public Health

Center for Injury Research & Policy

readings
Readings
  • Carrying passengers as a risk factor for crashes fatal to 16- and 17-year-old drivers
  • Reducing fatal crash risk among teenaged drivers
  • Graduated licensing: a blueprint for North America
learning objectives
Learning Objectives:
  • Understand the scope of MV injury for teenage drivers
  • Learn about the risk to teenage drivers of carrying passengers
  • Learn about the GDL system
performance goals
Performance Goals:
  • Be able to describe the importance of MV injury for teenagers
  • Be able to describe the risk of carrying passengers for teen driver
  • Be able to describe the ideal GDL system
background
Background

For U.S. teens, MV crashes

  • are the leading cause of death, accounting for 36% of all deaths
  • have a much higher rate than for older drivers
background gdl system
Background—GDL System
  • Lets teen drivers earn experience step by step and in a less risky environment
background central framework for gdl
Background--Central framework for GDL

Three stages

  • Supervised learner’s period
  • Intermediate license
  • Full license
background current gdl adoption in the u s
Background—Current GDL adoption in the U.S.
  • 30 states had adopted full graduated licensing systems
  • 14 states had some passenger restrictions
methods data
Methods--Data
  • FARS: All fatal crashes in the U.S.
  • GES: Sample of police reported crashes in the U.S.
  • NPTS: Survey of travel patterns in the U.S.
methods analysis
Methods--Analysis
  • Risk of death per 10 million trips
  • Risk of death per 1000 crashes
  • Relative risk and confidence intervals
results summary
Results-Summary
  • Fatal crash rates for drivers aged 16-17 increased with the number of passengers for both day and night
  • Crashes are more likely to be fatal in the presence of male, teen, and age 20-29 passengers
discussion p ossible explanations
Discussion--Possible explanations
  • Dangerous driving behaviors
  • Distraction
  • Alcohol involvement
discussion limitations
Discussion--Limitations
  • Unable to control alcohol
  • Do not have information on age of passengers in travel pattern
conclusions
Conclusions

Restrictions on carrying passengers should be considered for inclusion in graduated licensing systems for young drivers

further studies
Further Studies
  • Age of passengers
  • The relationship to alcohol use
  • Why carrying passengers increases risk