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CEE 495/771 – Fall 2008 Topic 9 Ramp Metering Ramp Metering.

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Presentation on theme: "CEE 495/771 – Fall 2008 Topic 9 Ramp Metering Ramp Metering."— Presentation transcript:

1 CEE 495/771 – Fall 2008 Topic 9 Ramp Metering Ramp Metering

2 CEE 495/771 – Fall 2008 RAMP METERING Metering Signal

3 CEE 495/771 – Fall 2008 WHY RAMP METERING  Safety (Breakup Platoon Traffic)  Maintain Freeway Operations 

4 CEE 495/771 – Fall 2008 FREEWAY FLOW Congested RegionFree-Flow Region

5 CEE 495/771 – Fall 2008 FREEWAY FLOW

6 CEE 495/771 – Fall 2008 RAMP METERING CLASSIFICATIONS

7 CEE 495/771 – Fall 2008 TRAFFIC-RESPONSIVE RAMP METERING Mainline Upstream Detectors Mainline Downstream Detectors Merge Detector Metering Signal Demand Detector Advanced Queue Detector Frontage Road Warning Sign/Signal

8 CEE 495/771 – Fall 2008 ALINEA Algorithm  Local traffic responsive  Based on feedback control theory

9 CEE 495/771 – Fall 2008 COORDINATED FREEWAY RAMP METERING

10 CEE 495/771 – Fall 2008 COORDINATED RAMP METERING SYSTEMS IN THE U.S.

11 CEE 495/771 – Fall 2008 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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