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Relationship Between Traffic Volume and Accident Frequency at Intersections.

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Traffic congestion management is key to reducing accidents. Higher traffic volumes increase accident frequency quadratically, while rainfall risk decreases with congestion.

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Area of Science:

  • Traffic safety research
  • Transportation engineering
  • Accident analysis

Background:

  • Traffic accidents cause significant social and emotional costs globally.
  • Understanding factors influencing accident occurrence, particularly congestion, is critical.
  • Existing research lacks consensus on the relationship between congestion management and accident rates.

Purpose of the Study:

  • To analyze the relationship between traffic volume, congestion, and accident frequency.
  • To investigate the impact of rainfall on traffic accidents under varying congestion levels.
  • To provide data-driven insights for effective traffic management strategies.

Main Methods:

  • Analysis of 1629 motor vehicle accidents at 120 intersections in Adelaide, Australia.
  • Utilized a dataset of over five million hourly traffic volume measurements.
  • Employed Poisson and negative binomial models to assess accident frequency and severity.

Main Results:

  • A near-linear relationship between traffic volume and accident frequency was observed at lower volumes.
  • A significant quadratic relationship emerged at higher traffic volumes, indicating accelerated accident frequency increase.
  • The relative risk of rainfall on accident frequency diminished as the congestion index rose.

Conclusions:

  • Traffic management strategies should prioritize mitigating high-congestion conditions to reduce accident frequency.
  • Rainfall poses a significantly higher accident risk during low congestion, with the risk diminishing as congestion increases.
  • Congestion levels did not show a significant impact on the severity of traffic accidents.