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The more (sharp) curves, the lower the risk.

Rune Elvik1

  • 1Institute of Transport Economics, Gaustadalleen 21, 0349, Oslo, Norway.

Accident; Analysis and Prevention
|October 11, 2019
PubMed
Summary

Accident risk on horizontal curves depends on radius and spacing. Shorter distances and sharper adjacent curves decrease accident risk, challenging assumptions about road safety design.

Area of Science:

  • Road safety engineering
  • Traffic accident analysis
  • Highway geometry

Background:

  • Accident risk in horizontal curves is influenced by multiple factors.
  • Interactions between curve characteristics and accident risk are complex.
  • Understanding these interactions is crucial for road safety.

Purpose of the Study:

  • To investigate the interaction between horizontal curve radius and the distance to adjacent curves.
  • To analyze how curve spacing affects accident risk.
  • To evaluate the impact of neighboring curve sharpness on overall risk.

Main Methods:

  • Review and summarization of existing studies on horizontal curve geometry and accident data.
  • Analysis of the relationship between mean distance between curves and accident risk.
Keywords:
Adjacent curveHorizontal curveInteractionsRadiusRisk

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  • Investigation of the correlation between neighboring curve sharpness and accident risk.

    • Main Results:

    • A shorter mean distance between horizontal curves is associated with a lower increase in accident risk for a given curve radius.
    • Sharper neighboring curves are linked to a lower increase in accident risk for a given curve radius.
    • Roads with frequent sharp curves may not have higher overall risk than roads with widely spaced curves.

    Conclusions:

    • The spatial arrangement of horizontal curves significantly influences accident risk.
    • Road design principles should consider the interplay between curve radius and inter-curve distances.
    • Safety on roads with numerous curves may be comparable to or better than roads with isolated curves.