Asset management

Cover of Level of Service Requirements for Freight on Rural Roads and Refinement of Heavy Vehicle Roughness Band Index
Level of Service Requirements for Freight on Rural Roads and Refinement of Heavy Vehicle Roughness Band Index
  • Publication no: AP-T340-18
  • ISBN: 978-1-925671-86-5
  • Published: 19 November 2018

Following on from previous work, the purpose of this project was to complete an investigation of subjective ratings of ride quality of A, B and C roads in Victoria while driving a passenger car and a range of heavy vehicles. This data was used to define Levels of Service (LOS) for rural roads. Vibration data was also collected for the roads surveyed and proof of concept for a new ride quality index for freight vehicles was developed. The Fleet Ride Index (FRI) allows the range of response in a heavy vehicle fleet to be determined from a longitudinal road profile. The heavy vehicle fleet can be customised to reflect actual fleet compositions to provide a more powerful and nuanced assessment of ride quality for heavy vehicles.

  • Summary
  • 1.      Introduction
    • 1.1    Project Objectives
    • 1.2    Outcomes from Previous Project
    • 1.3    Structure of this Report
  • 2.      Level of Service Requirements for Freight on Rural Roads
    • 2.1    Year One Overview
    • 2.2    Fieldwork Design
      • 2.2.1      Introduction to Fieldwork
      • 2.2.2      Sites
      • 2.2.3      Vehicles
      • 2.2.4      Survey Design
      • 2.2.5      Experiment Procedure
    • 2.3    Fieldwork Report
    • 2.4    Preliminary Data Analysis
      • 2.4.1      General Character of Ratings
      • 2.4.2      Dividing the Driver Population into Groups
      • 2.4.3      Analysis of Site Characteristics in Each Direction
      • 2.4.4      Effect of Road Class
      • 2.4.5      Mean Ride Quality Ratings by Group
      • 2.4.6      Mean Safety Ratings by Group
      • 2.4.7      Sensitivity Analysis of Ratings
    • 2.5    Findings – LOS Requirements
  • 3.      Development of a New Heavy Vehicle Ride Quality Index
    • 3.1    Year Two Overview
    • 3.2    Roughness Band Concept
      • 3.2.1      Features of Earlier Work to be Retained
      • 3.2.2      A Change of Name: the Fleet Ride Index
      • 3.2.3      Changes in the New Version
    • 3.3    Findings from Earlier Project
    • 3.4    Analysis of Seat Vibration Data
      • 3.4.1      Method of Analysis
      • 3.4.2      Comparison of Vehicle Configuration Performance
    • 3.5    New Ride-Quality Index for Heavy Vehicles
      • 3.5.1      Overview of Approach
      • 3.5.2      Relative Vehicle Configuration Response to Road Roughness
      • 3.5.3      Ride Quality Due to Design, Age and Condition
      • 3.5.4      The Fleet Ride Index Method
  • 4.      Conclusions
  • References
  • Appendix A          Site Selection Data
  • Appendix B          Briefing Slides for Drivers
  • Appendix C          Plots of Power Spectral Density (PSD) and Peak Magnitude Ratio