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INTEGRATING SIGNAL AND LANE CONTROL

INTEGRATING SIGNAL AND LANE CONTROL. Edward Lieberman, P.E. Jinil Chang, Ph. D. 2006 Annual Meeting Panel 5: Emerging Technologies June 9, 2006. Basic Principles. There are strong interactions among geometric configuration and signal timing plans which influence traffic performance

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INTEGRATING SIGNAL AND LANE CONTROL

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  1. INTEGRATING SIGNAL AND LANE CONTROL Edward Lieberman, P.E. Jinil Chang, Ph. D. 2006 Annual Meeting Panel 5: Emerging Technologies June 9, 2006

  2. BasicPrinciples There are strong interactions among geometric configuration and signal timing plans which influence traffic performance Treating these elements as an integrated system can yield optimal, adaptive lane allocation and signal-timing plans that are responsive to changing conditions 2006 Annual Meeting - Panel 5: Emerging Technologies

  3. 2006 Annual Meeting - Panel 5: Emerging Technologies

  4. 2006 Annual Meeting - Panel 5: Emerging Technologies

  5. Intersection Design and Control Given 1. Estimate traffic volumes, by movement ROW, Budget constraints Develop 2. Approach configurations Rules: < 450 vphl; VL > 100 vph, etc. Assert/ 3. Signal Cycle Length Compute 4. Signal Phasing Plans Compute 5. Signal Phase Durations 6. Signal Offsets A sequential “Waterfall” process 2006 Annual Meeting - Panel 5: Emerging Technologies

  6. For a given approach width, it is possible to design a number of different lane-use configurations. • Each can support several [different] signal phases and durations. How can we determine the best combination of approach configurations, signal phasing plan and signal timing for all time periods? 2006 Annual Meeting - Panel 5: Emerging Technologies

  7. Proposed Intersection Design Procedure Given, for every time period: Estimates of traffic volumes ROW, Budget constraints Over a selected range of signal cycle lengths… and for every viable Intersection configuration… Signal Phasing Plans Compute Signal Phase Durations Signal Offsets …and select the “best” design/lane allocation and control plan for each time period An integrated, exhaustive computational process 2006 Annual Meeting - Panel 5: Emerging Technologies

  8. Case 3(a) Case 11(c) Case 11(c) 2 Case 3(a) 3 4 1 Case 3(a) Case 3(b) Case 3(b) Case 3(a) ILLUSTRATIVE CONFIGURATIONS Configuration 1 Restrict parking on east-west approaches. Configuration 2 2006 Annual Meeting - Panel 5: Emerging Technologies

  9. Reference: Lieberman, E. and Chang, J., Ph.D., New Formulation to Analyze Signalized Approaches, paper presented at TRB, January 2006. www.kldassociates.com 2006 Annual Meeting - Panel 5: Emerging Technologies

  10. 2006 Annual Meeting - Panel 5: Emerging Technologies

  11. C = 90 sec. Configuration 1 Configuration 2 Evaluation Cycle Utilization Better Solution 1 0.7 2 3 4 0.8 1 5 2 6 0.9 3 7 Locus of Optimal Solution Configuration 1 8 1.0 4 5 Configuration 2 Oversaturated 1.1 Percent Left-Turns Protected 60 0 100 20 80 40 Operations/Safety Metrics 2006 Annual Meeting - Panel 5: Emerging Technologies

  12. Summary • We can evaluate combinations of approach configurations, signal phasing and timing plans for different time periods. • We can extend adaptive control to include dynamic lane allocation responsive to changing traffic demand patterns over the course of a day. 2006 Annual Meeting - Panel 5: Emerging Technologies

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