Traffic management

Cover of Freeway Incident Detection Technologies and Techniques
Freeway Incident Detection Technologies and Techniques
  • Publication no: AP-R364-10
  • ISBN: 978-1-921709-37-1
  • Published: 17 November 2010

This project aims to review current technologies and techniques for automatic freeway incident detection (AFID) and to provide guidance on the deployment of AFID applications, focusing on the operational aspects of incident detection. The focus is on the operational aspects of incident detection.

Freeway incident detection is an important component of freeway management apart from ramp metering, driver information, lane control and variable speed limits. The high level of false alarms in the past can be controlled with better calibration and operational experience and should not be a reason for not using freeway incident detection.

Future research should include the collection of more incident data, the study of performance of AFID algorithms under different flow conditions, and the assessment of different definitions and target values of performance indicators.

  • 1. INTRODUCTION
  • 2. CONTEXT OF FREEWAY INCIDENT DETECTION
    • 2.1. Defining Freeway Incidents
    • 2.2. Processes of Freeway Incident Management
    • 2.3. Communication Technologies for Incident Detection
  • 3. REVIEW OF VEHICLE DETECTOR TECHNOLOGIES
    • 3.1. Pneumatic Tubes and Other Axle Counters
    • 3.2. Ultrasonic Detectors
    • 3.3. Inductive Loop Detectors
    • 3.4. Video Image Detection
    • 3.5. Magnetic Sensors
    • 3.6. Microwave Detectors
    • 3.7. Infrared Sensors
    • 3.8. Acoustic Sensors
    • 3.9. Automatic Vehicle Identification (AVI)
    • 3.10. Summary
  • 4. REVIEW OF AFID ALGORITHMS
    • 4.1. Performance Indicators
  • Detection Rate (DR)
  • False Alarm Rate (FAR)
  • Time-to-detect (TTD) or Mean Time-to-detect (MTTD).
  • 5. CONSULTATIONS WITH JURISDICTIONS
    • 5.1. New South Wales
    • 5.2. Victoria
    • 5.3. Western Australia
    • 5.4. Queensland
    • 5.5. South Australia
    • 5.6. Other Jurisdictions
    • 5.7. Summary
  • 6. GUIDELINES ON SYSTEM PARAMETERS AND CALIBRATION
    • 6.1. Spacing between Detector Stations
    • 6.2. Time Resolution
    • 6.3. Recommended Target Values for Performance Indicators
    • 6.4. Calibration Procedures for AFID Algorithms
    • 6.5. Selection of AFID Algorithms
  • 7. CONCLUSIONS AND RECOMMENDATIONS
  • REFERENCES
  • APPENDIX A ABBREVIATIONS
  • APPENDIX B ALGORITHMS CALIBRATION AND SCREENING OF INCIDENTS
  • COMMENTARY 1