Asset management

Cover of Update of Vehicle/Road Relationships Underpinning Road User Costs and Externality Costs
Update of Vehicle/Road Relationships Underpinning Road User Costs and Externality Costs
  • Publication no: AP-T189-11
  • ISBN: 978-1-921991-02-8
  • Published: 7 October 2011

This publication reviews current methodologies for estimating vehicle operating costs (VOC). Recent Austroads work (TP1349) highlighted the need to improve the VOC-road roughness relationship. This report achieves this by conducting a literature review of overseas and local models and establishes if overseas models and recent Australasian work have improved the link between VOC and road roughness.

  • 1. INTRODUCTION
    • 1.1. Project Background
    • 1.2. Scope of the Report and Aims
  • 2. OVERVIEW OF VOC – ROAD ROUGHNESS STUDIES
    • 2.1. VOC Components
    • 2.2. Concept of Road Roughness
    • 2.3. Measures of Roughness
      • 2.3.1. Present Serviceability Rating (PSR)
      • 2.3.2. International Roughness Index (IRI)
      • 2.3.3. NAASRA Roughness Meter (NRM)
      • 2.3.4. Other Measures and Units
    • 2.4. Evolution and History
      • 2.4.1. Evolution and History of the VOC-roughness Relationship
      • 2.4.2. Australian Harmonisation Process
    • 2.5. Overview of International Practice
      • 2.5.1. Empirical Studies of VOC-roughness Relationship
      • 2.5.2. Other Influences on VOC
    • 2.6. Literature Review Summary
  • 3. FUEL CONSUMPTION – ROUGHNESS: MODELLING APPROACHES
    • 3.1. Multivariate Regression Techniques
      • 3.1.1. Functional Form
      • 3.1.2. Empirical Findings
    • 3.2. NIMPAC Models and Mechanistic Models
      • 3.2.1. Functional Form
      • 3.2.2. Assessment of Modelling Approaches
    • 3.3. Empirical Findings of Mechanistic Models
      • 3.3.1. Effect of Roughness – Constant Speed
      • 3.3.2. Effect of Roughness – Variable Speed
    • 3.4. Recent Efforts on Harmonisation in Australia
      • 3.4.1. Harmonisation in Fuel Consumption Models
    • 3.5. Summary and Modelling Considerations for Australia
      • 3.5.1. Summary of Findings
      • 3.5.2. Modelling Considerations for Australia
  • 4. REPAIRS AND MAINTENANCE – ROUGHNESS: MODELLING APPROACHES
    • 4.1. Modelling Approaches
      • 4.1.1. NIMPAC Models
      • 4.1.2. HDM Models
      • 4.1.3. HDM-C Model
    • 4.2. Overseas Empirical Findings
      • 4.2.1. Light Vehicles
      • 4.2.2. Heavy Vehicles
    • 4.3. Australian Experience
      • 4.3.1. Earlier Study
      • 4.3.2. Recent Australian Study
    • 4.4. New Zealand Study
      • 4.4.1. Light Vehicles
      • 4.4.2. Heavy Vehicles
    • 4.5. Recent Harmonisation Efforts in Australia
    • 4.6. Summary and Modelling Considerations for Australia
      • 4.6.1. Summary of Findings
      • 4.6.2. Modelling Considerations for Australia
  • 5. ROUGHNESS AND OTHER VOC COMPONENTS
    • 5.1. Tyre Wear
      • 5.1.1. Modelling Approaches
      • 5.1.2. Overseas Empirical Findings
      • 5.1.3. Australian Study
      • 5.1.4. Recent Australian Work on Harmonisation
    • 5.2. Lubricating Oil
      • 5.2.1. Modelling Approaches
      • 5.2.2. Modelling Findings: Australia
      • 5.2.3. Recent Australian Work on Harmonisation
    • 5.3. Vehicle Depreciation
    • 5.4. NIMPAC Variations
    • 5.5. Summary and Modelling Considerations
      • 5.5.1. Modelling Considerations for Australia
  • 6. THE WAY FORWARD
    • 6.1. Future Steps
  • REFERENCES
  • APPENDIX A BASE VEHICLE REPAIR AND MAINTENANCE COSTS
  • APPENDIX B MIRIAM – RECENT DEVELOPMENTS