10- 2nd_lecture_Network_Analysis

10- 2nd_lecture_Network_Analysis - Transportation Network...

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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 ?
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  • Spring '07
  • MEYBURG/MBWANA
  • pH, Supply And Demand, transportation network, travel time, C. Composite Networks, Network Equilibrium

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