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Modelling very large Transport Systems

This presentation outlines the use of the TRANSIMS modelling system to simulate the transport dynamics of Milton Keynes, UK. It details the methodology for creating a multilevel representation of transport systems, emphasizing the importance of subsystems in large-area behaviour. The study explores data generation from travel demand, employing a microscopic approach that represents individual activity patterns. Results indicate promising outputs, with potential for model enhancement. Future work aims to refine the model and develop additional representation levels for comprehensive conclusions.

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Modelling very large Transport Systems

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  1. Modelling very large Transport Systems Joan Serras Department of Design, Development, Environment and Materials The Open University One-day Conference on Traffic Modelling

  2. Presentation outline • Introduction: a Multilevel Representation on transport systems • The TRANSIMS modelling system and its modules • A simulation of Milton Keynes using TRANSIMS • Conclusions and further work One-day Conference on Traffic Modelling

  3. Introduction • The role of subsystems is essential on the behaviour of very large areas • Transport network models available which can address such areas (~106 inhabitants) • These models represent the road network at one level • TRANSIMS is not an exception • A methodology has been implemented to generate a multilevel representation using a simulation of Milton Keynes with TRANSIMS One-day Conference on Traffic Modelling

  4. The TRANSIMS modelling system • Developed in Los Alamos during 1990s • Forecast the travel behaviour of a study area: information on traffic impact, congestion and pollution • Relevant studies: • First study (1997): metropolitan region within Dallas (~200,000 travellers) • Portland Study (2002): ~1.5 million travellers • Swiss study (2004): morning peak simulation (~1 million trips) – 7.2 million inhabitants One-day Conference on Traffic Modelling

  5. The TRANSIMS modelling system • Microscopic approach: travel demand estimated at the person level • “synthetic population”: a virtual representation of all the individuals living in the study area • Activity-based demand rather than trip-based • Urban activity locations defined at the household level • Output of the person movement on a second-by-second basis (24h simulation) • Parallel computing One-day Conference on Traffic Modelling

  6. TRANSIMS’ core modules One-day Conference on Traffic Modelling

  7. A simulation of Milton Keynes using TRANSIMS • Purpose of the study: • Can we get the data to build a multilevel representation from the TRANSIMS output? • Check its functionality in our system (cluster at the OU) • Can we adapt it to simulate a non-US city? (synthetic population generation constraints) • Significant output? • Constraints: • Prime use of the software in UK • lack of time (PhD period) • Lack of resources: only me! • Due to constraints: many assumptions were done One-day Conference on Traffic Modelling

  8. A simulation of Milton Keynes using TRANSIMS • Facts about Milton Keynes population (Census 2001): • Population: ~200,000 inhabitants (urban area: ~170,000 inhabitants) • Commuters (~60,000 commuters): • 22,000 people commuting outside Milton Keynes (mainly to London area) • 39,000 people commute to Milton Keynes • The Milton Keynes road network: • A road grid (10 “horizontal” x 11 “vertical roads”) • 1km2 each grid for easy access between them • ~300 roundabouts • GIS representation: 2630 nodes and 3457 links One-day Conference on Traffic Modelling

  9. One-day Conference on Traffic Modelling

  10. A simulation of Milton Keynes using TRANSIMS • Milton Keynes network • From NTFS format to TRANSIMS format • No traffic lights, no public transport • The synthetic population (Census 2001) • US Census incompatibility: new method implemented • Household structure (150,000 inhabitants) • Commuters (26,000 to MK; 13,000 out of MK) • Activity Generation • survey from Balcksburg, VA (lack of time – not that different: work, shop, visit activity types kept) • Feedback • 50 iterations between Router and Microsimulator One-day Conference on Traffic Modelling

  11. A simulation of Milton Keynes using TRANSIMS • Clips on the Milton Keynes model can be seen in the following website: • http://design.open.ac.uk/serras/miltonKeynes_simClips.htm One-day Conference on Traffic Modelling

  12. Conclusions and further work • A simulation of Milton Keynes using TRANSIMS has been produced at the OU • Fairly good results have been produced • Significant margin for improvement • Currently working on improving the model • Data has already been used on a two-level representation • More levels need to be defined in order to infer relevant conclusions One-day Conference on Traffic Modelling

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