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Enhancing Freeway Safety Through Ramp Metering: Coordinated Systems

Explore the implementation of coordinated ramp metering systems in the U.S. to improve freeway safety by efficiently managing traffic flow, breaking platoons, and maintaining operations in free-flow and congested regions. Learn about traffic-responsive and coordinated algorithms utilized in different cities.

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Enhancing Freeway Safety Through Ramp Metering: Coordinated Systems

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  1. Topic 9 Ramp Metering

  2. RAMP METERING Metering Signal

  3. WHY RAMP METERING • Safety (Breakup Platoon Traffic) • Maintain Freeway Operations 

  4. FREEWAY FLOW Free-Flow Region Congested Region

  5. FREEWAY FLOW

  6. RAMP METERING CLASSIFICATIONS

  7. TRAFFIC-RESPONSIVE RAMP METERING Mainline Upstream Detectors Mainline Downstream Detectors Demand Detector Merge Detector Warning Sign/Signal Metering Signal Frontage Road Advanced Queue Detector

  8. ALINEA Algorithm • Local traffic responsive • Based on feedback control theory

  9. COORDINATED FREEWAY RAMP METERING

  10. COORDINATED RAMP METERING SYSTEMS IN THE U.S.

  11. COORDINATED RAMP METERING ALGORITHMS • BOTTLENECK Algorithm - Seattle, WA • ZONE Algorithm - Twin Cities, MN • HELPER Algorithm - Denver, CO • SWARM Algorithm - Irvine, CA

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