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DOWNSTREAM QUEUES ON UPSTREAM CAPACITY EXPANSION at URBAN SIGNALIZED INTERSECTIONS

Xin (Alyx) Yu, E.I.T. University of Hawaii at Manoa Presented at the ITE Western District Annual Meeting June 25, 2012. DOWNSTREAM QUEUES ON UPSTREAM CAPACITY EXPANSION at URBAN SIGNALIZED INTERSECTIONS. Outlines. Problem Solution Application Conclusion. PROBLEM.

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DOWNSTREAM QUEUES ON UPSTREAM CAPACITY EXPANSION at URBAN SIGNALIZED INTERSECTIONS

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  1. Xin (Alyx) Yu, E.I.T. University of Hawaii at Manoa Presented at the ITE Western District Annual Meeting June 25, 2012 DOWNSTREAM QUEUES ON UPSTREAM CAPACITY EXPANSION at URBAN SIGNALIZED INTERSECTIONS

  2. Outlines • Problem • Solution • Application • Conclusion

  3. PROBLEM

  4. Downstream Spillback • Restricted upstream capacity • Deteriorating downstream traffic conditions

  5. Existing Approaches • Traffic simulation/modeling • Simtraffic • VISSIM • TransCAD • EMME/2 • Complex Algorithm • Genetic algorithm (GA)-based • Macroscopic hypothetical model

  6. Weaknesses of Existing Methods • Data-intensive or compute-intensive • Expensive to gather the data • Impractical for a project in the early stage of alternative screenings • Impractical for a minor/temporary project with a limited budget

  7. So we need…… • A quick process to analyze downstream queuing effects • Using the basic and typically available data • Must be reliable and easy to use

  8. SOLUTION

  9. We have HCM…… • Investigate capacity constraint of downstream queues by reversing and integratingthe HCM procedures of intersection capacity and queue length estimation HCM 2010: f (X,Y) = Z f(Arrival Rate (X) , Signal Timing (Y)) = Vehicle Queue Length (Z) Our method: f (Z,Y) = Y f(Max Allowable Queue Storage Length , Downstream Intersection Signal Timing) = Max Downstream Allowable Arrival Rate

  10. Example: Is there queue spillback at EB downstream?Existing EB Downstream Entry Volume V.S. Max Downstream Allowable Arrival Rate.√If less, no queue spillback and upstream capacity expansion is possible√ If greater or equal to, queue spillback will occur or is about to occur

  11. Spreadsheet Tools • Developed using Microsoft Excel 2007 • A one page worksheet containing three sections: Inputs, Summary and Output. Download available at my personal website: http://www2.hawaii.edu/~xinyu (model tab)

  12. APPLICATION

  13. Vineyard Blvd. and Punchbowl St. • Two capacity expansion options on the WB: 1. Underpass lane 2. At-grade lane

  14. Analysis and Evaluation

  15. Analysis and Evaluation Existing With Project

  16. CONCLUSION

  17. Conclusion • This process can answer: 1. Spillback occurrence (when and where) 2. The feasibility of intersection treatments (considering intersection interactions) • This process can be used in: 1. Project screening and planning level assessment 2. Developing a prioritized list of potential capacity expansion in urban corridor.

  18. Questions and Comments Xin (Alyx) Yu, E.I.T. University of Hawaii at Manoa Email: xinyu@hawaii.edu Personal Website: www2.hawaii.edu/~xinyu

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