10- 2nd_lecture_Network_Analysis

10- 2nd_lecture_Network_Analysis - V 12 = V A = V B TT 12...

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Transportation Network Analysis Related to the Trip Assignment Phase of the UTP Process Objective: Predict Link Flow » (Find “Weak” Links) Elements of Network Analysis Link • (Direction, Capacity, V/C Ratio, Length, Travel Time, Design Speed, Traffic Flow, etc.) Node • (Type of Intersection, e.g. Signalized, Non- signalized, Turning Restrictions.) Zone • (Traffic Zone where trips are generated) Volume • (Trips between Zones) Flow • (Trips along a link or through a node)
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Problem with Demand and Supply Data Demand – Specified with respect to zone- to-zone paths Supply – Specified with respect to individual links (Arcs) Issue : How do we relate the zonal demand to the link-based supply? Zone i Zone j Zone j Zone i
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Network Equilibrium A. Single Link Connecting Two Zones Zone 1 Travel Time Travel Time Volume Volume Demand S 1 Capacity Cap 1 S 2 Demand Supply Zone 2 Cap 2
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Zone 1 Travel Time Travel Time Volume Volume Demand S B Cap A S A Demand Zone 2 B. Links in Series Link A Link B Node S B S A Cap B V A V B ? ? Cap A Cap B
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Travel Time Volume S B S A D 12 B. Links in Series (Continued)
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Unformatted text preview: V 12 = V A = V B TT 12 TT A TT B Network Equilibrium Zone 1 Zone 2 Link B Node Link A Cap A Cap B Cap 12 Whats wrong with this diagram? Travel Time Volume S B S A D 12 B. Links in Series (Continued) V 12 = V A = V B TT 12 TT A TT B Network Equilibrium Zone 1 Zone 2 Link B Node Link A Cap B Cap 12 Travel Time Volume S B S A D 12 C. Links in Parallel V 12 TT 12 = TT A = TT B Network Equilibrium Zone 1 Zone 2 Link B Link A V B V A Cap A Cap B Cap 12 Travel Time Volume S B S A D 12 C. Composite Networks S C Zone 1 Zone 2 Link B Link A Link C Travel Time Volume S B S A S A+ B Node Cap A Cap B Cap C Cap A+B TT 1 2 V 1 2 = V C D 12 C. Composite Networks (Continued) Zone 1 Zone 2 Link B Link A Link C Travel Time Volume S C S A+ B Network Equilibrium TT C TT A,B Cap A+B Cap A+B+C Perceived price of travel Volume Demand Curve Equilibration V 1 P 1 P 3 P 2 (Balancing of Supply and Demand) V 7 V 2 V 4 V 3 V 6 V 5 Price-Volume Curve P 6 P 5 P 4...
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10- 2nd_lecture_Network_Analysis - V 12 = V A = V B TT 12...

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