DISCO - 1 Dynamic Intersection Signal Control Optimization(DISCO Hong K LO Civil Engineering Hong Kong University of Science and Technology Traffic

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1 Dynamic Intersection Signal Control Optimization (DISCO) Hong K LO Civil Engineering Hong Kong University of Science and Technology
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2 Traffic Control Basics : Queue Traffic Flow Traffic Flow Traffic Flow
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3 Traffic Control Basics : Queue Traffic Flow Traffic Flow Traffic Flow
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4 Forward progression: light traffic Traffic
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5 Forward progression: severe congestion Traffic
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6 Existing Traffic Signal Control Approaches • Static Models – don’t work well for congested traffic – e.g. TRANSYT, MAXBAND, PASSER • Dynamic Models – don’t work for light traffic – ignore the fundamental diagram
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7 Fundamental Diagram Flow f Density k k jam Normal Flow Forced Flow Q max Optimum Density
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8 Flow f Density k Q max k jam k1 k2 (f, k2) Flow-density Relationship (f, k1)
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9 Potential Problems • No operational model for over- saturated traffic • Traffic conditions fluctuate from light to saturated daily • Frequent manual overrides are common
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10 Features of This New Formulation • Models dynamic traffic • Captures queue dissipation and formation dynamics, kinematic waves. • Covers the entire range of traffic conditions • Modify traffic density to the optimum flow level in over-saturated traffic
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11 Dynamic Intersection Signal Control Optimization (DISCO) • Minimize total dynamic delay, subject to – Cell-Transmission Model (Daganzo, 1994, 1995) (CTM) to model traffic dynamics – Timing plan constraints, max green, cycle time, etc.
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12 Simplified Flow-density Relationship Flow f Density k Q max k jam Simplified Original
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13 Model Components • Cell-Transmission Model (Daganzo, 1994, 1995) (CTM) to model traffic dynamics – a convergent approximation to the Lighthill and Whitham (1955) and Richards (1956) (LWR) model • Mixed-integer programming technique to incorporate CTM into a mathematical program
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14 Simplified Flow-density Relationship Flow f Density k Q max k jam Simplified Original
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15 Network Example link 1 123 link 2 12 3 link 3 1 link 4 1 3 2 link 5 1 link 6 1 3 2 link 7 1
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This note was uploaded on 12/24/2011 for the course CIVL 563 taught by Professor Hklo during the Fall '10 term at HKUST.

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DISCO - 1 Dynamic Intersection Signal Control Optimization(DISCO Hong K LO Civil Engineering Hong Kong University of Science and Technology Traffic

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