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Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
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Safety performance functions incorporating design consistency variables.

Alfonso Montella1, Lella Liana Imbriani1

  • 1Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, Via Claudio 21, 80125 Naples, Italy.

Accident; Analysis and Prevention
|December 3, 2014
PubMed
Summary

Highway design consistency significantly impacts rural motorway safety. Incorporating design consistency measures into safety performance functions helps reduce crashes and improve driver performance on roads.

Keywords:
Consistency in driving dynamicsContinuous speed profilesDesign consistencyInertial speed consistencyOperating speed consistencySafety performance functions

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Area of Science:

  • Civil Engineering
  • Transportation Engineering
  • Traffic Safety

Background:

  • Road design consistency ensures harmonious driver performance, while inconsistencies increase crash frequency.
  • Existing safety performance functions (SPFs) need enhancement to address highway design inconsistencies.
  • Rural motorways, like other highways, can suffer from design inconsistencies impacting safety.

Purpose of the Study:

  • Develop new safety performance functions for rural motorways.
  • Incorporate geometric design consistency measures into these functions.
  • Improve the reliability of SPFs and address design inconsistencies.

Main Methods:

  • Fitted two sets of models for tangents and curves, analyzing various crash characteristics.
  • Utilized operating speed models based on GPS data from instrumented vehicles.
  • Incorporated design consistency parameters: driving dynamics, operating speed, inertial speed, and tangent length.

Main Results:

  • Geometric design consistency significantly affects rural motorway safety.
  • Design consistency measures were found to be significant explanatory variables in the developed SPFs.
  • Key significant measures include consistency in driving dynamics, operating speed, inertial speed, and tangent length.

Conclusions:

  • Geometric design consistency is crucial for motorway safety, not just two-lane highways.
  • The developed SPFs incorporating design consistency enhance understanding of crash causation.
  • Achieving proper geometric design consistency is a key element for safer motorway design.