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Hazard Ratio01:12

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The hazard ratio (HR) is a widely used measure in clinical trials to compare the risk of events, such as death or disease recurrence, between two groups over time. It reflects the ratio of hazard rates—the instantaneous risk of the event occurring—between a treatment group and a control group. This measure provides valuable insights into the relative effectiveness of a treatment by assessing how the risk of an event differs between the two groups.
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Related Experiment Video

Updated: Apr 9, 2026

Driving Simulation in the Clinic: Testing Visual Exploratory Behavior in Daily Life Activities in Patients with Visual Field Defects
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Can a video-based hazard perception test used for driver licensing predict crash involvement?

Mark S Horswill1, Andrew Hill1, Mark Wetton1

  • 1School of Psychology, The University of Queensland, St Lucia, Brisbane QLD 4072, Australia.

Accident; Analysis and Prevention
|June 21, 2015
PubMed
Summary

New drivers who failed Queensland's hazard perception test (HPT) showed a 25% increased likelihood of active crashes post-licensure. This video-based assessment appears to be a valid predictor of crash risk in novice drivers.

Keywords:
DrivingHazard anticipationRoad traffic accidentsSituation awareness

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Area of Science:

  • Road safety research
  • Driver behavior analysis
  • Traffic psychology

Background:

  • The introduction of a video-based hazard perception test (HPT) in Queensland, Australia, in 2008 for new drivers.
  • The critical need to validate driver licensing tests by correlating scores with real-world crash involvement.

Purpose of the Study:

  • To assess the validity of the hazard perception test (HPT) as a predictor of crash involvement.
  • To determine if failing the HPT is associated with a higher incidence of active crashes among new drivers.

Main Methods:

  • Analysis of crash data for drivers in Queensland over a one-year period following their licensing test.
  • Statistical control for driving exposure, age, and sex to isolate the effect of HPT performance.
  • Utilized a ROC curve-derived pass mark to categorize drivers as pass or fail.

Main Results:

  • Drivers who failed the HPT were 25% more likely to be involved in active crashes within one year post-test.
  • Failing drivers also exhibited a 17% higher likelihood of prior active crash involvement since obtaining their provisional license.
  • These associations remained significant after controlling for key confounding variables.

Conclusions:

  • The hazard perception test (HPT) demonstrates validity as a measure of crash-related driving performance.
  • The findings support the continued use and potential refinement of the HPT in driver licensing.
  • The HPT effectively identifies novice drivers at higher risk for future crashes.