Road Design
Truck Side / Longitudinal Friction Literature Review and Data Analysis
- Publication no: AP-T361-21
- ISBN: 978-1-922700-03-2
- Published: 26 November 2021
- PDF (free) Download
Practitioners have raised concerns when designing for heavy vehicles with respect to the combination of design values for side and longitudinal friction demand as well as design criteria for horizontal curves with adverse superelevation.
This report examines the current Austroads design criteria and guidance with respect to truck friction factors, taking into account how and when they arose and subsequently incorporated into the current guide.
The report provides:
- A literature review of relevant technical reports, including industry feedback obtained in ATP-T293-15 and other Australian research and testing along with a broader literature review to expand and confirm knowledge of the subject.
- Analysis of the combination of longitudinal and side friction demand for a range of operating conditions and tested for curves with positive superelevation and for curves with negative (adverse) superelevation.
- Recommendations for future updates to the Austroads Guide to Road Design Part 3 and further research and assessment.
- Summary
- 1. Introduction
- 1.1 Purpose
- 1.2 Scope
- 1.3 Methodology
- 2. Background to Friction Related Design Criteria for Trucks in Austroads Guide to Road Design Part 3
- 3. Review Documents
- 3.1 Geometric Design for Trucks: When, Where and How
- 3.2 Acceleration and Deceleration Testing for Combination Vehicles
- 3.3 Expanded Operating Speed Model
- 3.4 The Tyre Grip
- 4. Key Issues from Literature Review
- 5. Data Analysis Arising from Literature Review
- 5.1 Truck Braking on Horizontal Curves with Positive Superelevation
- 5.2 Truck Braking on Horizontal Curves with Adverse (Negative) Superelevation
- 6. Conclusions and Recommendations
- 6.1 Curves with Positive Superelevation
- 6.2 Curves with Negative Superelevation
- 6.3 Recommendations
- References
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