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Fuzzy Dynamic Traffic Assignment Model

Fuzzy Dynamic Traffic Assignment Model. Transportation Program, CEE Xuegang Ban Dec. 14, 2001. Introduction to Traffic Assignment. Assign Traffic Flow to Links of The Network Given OD Assumption: Each Driver Tries to Minimize His Perceived Travel Time Characteristics:

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Fuzzy Dynamic Traffic Assignment Model

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  1. Fuzzy Dynamic Traffic Assignment Model Transportation Program, CEE Xuegang Ban Dec. 14, 2001

  2. Introduction to Traffic Assignment • Assign Traffic Flow to Links of The Network Given OD • Assumption: Each Driver Tries to Minimize His PerceivedTravel Time • Characteristics: - Stochastic and Dynamic - Fuzziness of Driver’s Perception Over Travel Time

  3. Fuzzy Sets of Perceived Link Travel Time • Deterministic Link Travel Time • Actual Link Travel Time • Fuzzy Sets of Perceived Link Travel Time • NORMAL • CONGESTED • INCIDENT • CONSTRUCTION • SPECIAL EVENTS Membership Functions for Fuzzy Sets of Perceived Link Travel Time

  4. Fuzzy Sets of Perceived Path Travel Time • Fuzzy Number Addition Problem • Dubois and Prade’s method - Flattening, Decomposition, Operation * and Union Fuzzy Addition Illustration

  5. Fuzzy Assignment • Use Fuzzy Shortest Path Algorithm to Find S (Blue and Bush’s Method) S: Set of Shortest Paths • Membership: • : Traffic Flow from Origin O to Destination D • : Traffic Flow in Path

  6. Results • Test Network: • Link Properties:

  7. Results (Cont.) — Scenario #1 • All Links Are NORMAL • Both SDTA/FDTA Can Solve • This Problem • Difference Is Less Than 4%

  8. Results (Cont.) – Scenario #2 • Link 1 and 6 Are CONGESTED • All Other Links Are NORMAL • FDTA Can Solve This Problem • SDTA Cannot. • Most of Drivers(70%) Will Choose • 1->4->5->6->2(Link 2, 4, 5, 7)

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