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Mesoscopic Simulation

Mesoscopic Simulation. TRANSYT for Modelling Networks. What is a Mesoscopic Model?. Micro Sims High level of detail – modelling on a individual vehicle basis Macro Sims Relatively low level of detail – section by section basis, aggregate results Meso Key Characteristics

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Mesoscopic Simulation

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  1. Mesoscopic Simulation TRANSYT for Modelling Networks

  2. What is a Mesoscopic Model? Micro Sims • High level of detail – modelling on a individual vehicle basis Macro Sims • Relatively low level of detail – section by section basis, aggregate results Meso Key Characteristics • Combines some properties of both micro and macro simulations • Sits somewhere between micro and macro simulations

  3. How Does the Model Work? • Signal Phases • Intersection Geometry • Lane Capacities Traffic Demands Model Assumptions Inputs • Driver behaviour rules • Basic laws of movement • Pedestrians • Cyclists • Cars • % Heavies Outputs Multiple Optimisation Tools • Fast & Efficient • Slow but Better • Journey Times • Level of Service • Delay • Mean Max Queue • DoS • Performance Index

  4. Typical User Interface – TRANSYT Example Lane based traffic model helps to easily define permitted movements and routes through the network Quick links conveniently place the most commonly used tools Familiar Phase Sequence Diagram

  5. Typical Outputs We Expect – TRANSYT Example

  6. Strengths of TRANSYT User friendly network tools SCATS traffic data can be imported Import of data from micro sims Single or multiple intersections to be optimised Models blocking back of queue lengths across the network Use of different cycle times across the same network Graphical representation of traffic lanes and signal operation 3D representation of network with 3D animation Integrated pedestrian behaviour model Flexibility to model parallel walk phases

  7. Video Example http://www.youtube.com/watch?v=cESN19r9QGo&feature=c4-overview&list=UUQJ2ZzxQC8c-ldlWSLeGmhw

  8. Weaknesses of TRANSYT Large network models can be time consuming Software is currently unfamiliar with MRWA Currently few training courses in Australia Further research required on parallel walk phases

  9. Typical Usage Scenarios Networks of closely spaced intersections Freeway interchanges Where blocking back is known to affect upstream intersections

  10. Typical Usage Scenarios Ads photo of Murray/George and Murray/Elder

  11. THANK YOU

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