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Updated: Oct 30, 2025

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Detection of Geometric Risk Factors Affecting Head-On Collisions through Multiple Logistic Regression: Improving

Laura Cáceres1, Miguel A Fernández1, Alfonso Gordaliza1

  • 1Departamento de Estadística e Investigación Operativa, Escuela de Ingenierías Industriales, Universidad de Valladolid, 47011 Valladolid, Spain.

International Journal of Environmental Research and Public Health
|July 2, 2021
PubMed
Summary

Road geometry impacts head-on collisions on rural roads. Wider pavements, intermediate lane widths, and tight curves increase crash risk, while paved shoulders offer protection. Converting "1+1" to "2+1" roads can enhance safety.

Keywords:
2+1 roadscenterline treatmenthead-on crashroad safetytwo-way rural roads

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Area of Science:

  • Road safety engineering
  • Traffic accident analysis
  • Transportation planning

Background:

  • Head-on collisions are a significant cause of fatalities on rural roads.
  • Understanding geometric design factors influencing crash occurrence is crucial for safety improvements.

Purpose of the Study:

  • To identify specific geometric road design features associated with increased head-on crash likelihood on two-way rural roads.
  • To quantify the risk factors contributing to head-on collisions.

Main Methods:

  • A case-control study was conducted on Spanish "1+1" rural roads.
  • Multiple logistic regression models were used to analyze road design parameters.
  • Crash sites (cases) were compared with non-crash sites (controls).

Main Results:

  • Pavement width exceeding 6m, intermediate lane widths (3.25-3.75m), and curves with radii < 250m significantly increase head-on crash odds.
  • Paved shoulders were identified as a protective factor, reducing crash risk.
  • The study provides a model to compute the odds of a head-on collision based on road characteristics.

Conclusions:

  • Specific geometric configurations on two-way rural roads elevate head-on collision risk.
  • Roadway modifications, such as converting "1+1" to "2+1" roads, can mitigate these risks.
  • Implementing these findings can prevent serious injuries and improve overall transportation safety.