Road safety

Cover of Providing for Road User Error in the Safe System
Providing for Road User Error in the Safe System
  • Publication no: AP-R460-14
  • ISBN: 978-1-925037-69-2
  • Published: 23 May 2014

This project investigated the feasibility and cost of moving towards a truly Safe System infrastructure. The key feature of such an infrastructure is that it be designed to preserve safety in the face of driver fallibility.

The project first analysed the actual errors that drivers make. This provided an evidence-based means of assessing how effective different types, numbers and combinations of countermeasures are likely to be in mitigating the impact of the errors that drivers make. This in turn allowed an estimate to be made of the plausibility and cost of implementing various models that can be applied as various degrees of approximation to an error tolerant system in a particular road environment.

  • 1. Introduction
    • 1.1. The CASR In-depth Crash Database
    • 1.2. Project Aims
    • 1.3. Structure of the Report
  • 2. Approaches to Error Assessment
    • 2.1. Review of Existing Approaches
      • 2.1.1. Person versus System Approaches
      • 2.1.2. Reason’s Model
      • 2.1.3. Stanton and Salmon (2009)
      • 2.1.4. Wierwille et al. (2002)
    • 2.2. Current Approach
      • 2.2.1. Methodology
      • 2.2.2. Workshop
      • 2.2.3. Results
    • 2.3. Results
      • 2.3.1. Reliability and Applicability
    • 2.4. Conclusions
  • 3. Trialling the Approach
    • 3.1. Methodology
      • 3.1.1. Determining Attributes of the Areas
      • 3.1.2. Detailed Description of the Areas
      • 3.1.3. Costs Associated with the Treatments
      • 3.1.4. Treatment Scenarios
      • 3.1.5. Application of the Treatments to the Study Areas
    • 3.2. Results
      • 3.2.1. Total Protection Model
      • 3.2.2. Partial Protection Model – Top 6 Treatments
      • 3.2.3. Partial Protection Model – Top 3 Treatments
      • 3.2.4. Comparing Total Protection vs Top 6 vs Top 3
      • 3.2.5. Discourage Errors Model – All Treatments
      • 3.2.6. Discourage Errors Model – Top 6 Treatments
      • 3.2.7. Discourage Errors Model – Top 3 Treatments
      • 3.2.8. Comparing ‘Discourage Errors’ All Treatments vs Top 6 vs Top 3
      • 3.2.9. Hybrid Model – Top 6 ‘Protect’ Plus Top 6 ‘Discourage’
      • 3.2.10. Hybrid Model – Top 6 ‘Protect’ Plus Additional ‘Discourage’ Treatments to Address the Gap
      • 3.2.11. Hybrid Model – Top 3 ‘Protect’ Plus Additional ‘Discourage’ Treatments to Address the Gap
      • 3.2.12. Comparing the Hybrid Models
    • 3.3. Conclusions – Comparing All Models to Each Other
  • 4. Contributing to a Safe System through Infrastructure
  • References