URBAN PLANNINGTRANSPORT PLANNINGOPERATIONS - PowerPoint PPT Presentation

Title: URBAN PLANNINGTRANSPORT PLANNINGOPERATIONS


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An Integrated Approach for Traffic
Modeling Case Studies withAIMSUN
Alex Torday, Consulting Director TSS-Transport
Simulation Systems
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INDEX

• TSS Introduction
• Software package
• Integrated environment
• Concrete applications
• Real time forecasting
• Future developments

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TSS and Aimsun History

• 18 years of RD including 20 national and
  EU-funded research programmes
• 10 years of commercial history and 8 commercial
  releases
• 100s of real-life projects
• 1 development team

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Aimsun Licences Worldwide
395 Organizations gt 927 Users
licences
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The Aimsun 6 simulation environment
AIMSUN 6
AIMSUN LOGISTICS
AIMSUN ONLINE
AIMSUN MICRO
AIMSUN MESO
AIMSUN MACRO
AIMSUN PLATFORM (GIS based network edition)
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The integrated approach
Which modelling approach is better?
When should a specific modelling approach be used?
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Conceptual Architecture
Network data base
Paths and path flows data base
MACRO
Static assignment
MESO
Dynamic Assignment One shot or iterative
MICRO
OD Matrices
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Paris Tramway implementation

• Target
• Feasibility of Tram pre-emption
• Evaluate the capacity decrease of different
  implementation scenarios
• Results
• Axial option offers best results
• Bus stop location should revised

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Big event access management

• Target
• Pedestrian impact on traffic
• Pedestrian bridge option assessment
• Results
• Impact judged too important
• New crossing design to be examined

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Pedestrian integration Aimsun Legion
Outputs and analysis in both Software packages
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NGSIM project UC Berkley study

• Objective
• Testing their own lane selection model
• Using the Aimsun SDK capabilities

The I-80 Site with the detector locations
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Validation observed vs. simulated
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Validation observed vs. simulated
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HCM Outputs Level of Service
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HCM Outputs Level of Service
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Spanish freeway lane changing behaviour
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Spanish freeway lane changing behaviour
Speed / Flow
lane use
Real
Simul.
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New development area in Brisbane

• Target
• Assess impact of the development area traffic on
  down-town network
• Expected intersections capacity decrease due to
  additional pedestrian flows
• Results
• Demonstrate to public authorities the project
  feasibility

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The micro model
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Micro Macro relation
Macro level
Micro level
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Results
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Results
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Synchro import and export
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Macroscopic Modelling

• 3 main features
• Traffic Assignment (Static User Equilibrium)
• OD Matrix Adjustment
• from link ,and turning, counts and flows
• Traversal Generation (Cordoning)
• window-in on a subnetwork for microsimulation
  study
• Extract O/D matrix for gate to gate traversals

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Real time forecasting
REACTION
ANTICIPATE
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Needs

• Network status forecasting and monitoring
• Help control centers to take decisions and to
  inform
• Basement for any ATIS and ATMS applications

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Why traffic simulation?

• Analytical approach limitations
• Complexity of the networks
• Unlimited combination of events
• Plentiful of outputs to be used

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The simulation role
REAL-TIME SIMULATION
OFF-LINE MODELING DATA
CURRENT AND FUTURE COMPLETE TRAFFIC DATA
ON-LINE LIMITED TRAFFIC DATA
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Monitoring
CO2 Emission 43 g/h

• Data source for any ATIS application
• Information for ALL network links
• Quality assessment tool (performance,
  environmental, )
• Navigation Systems data supply

Traffic status Fluid
LOS E
Travel Time 87 sec
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Emergency vehicle routing
ACCESS ROUTE A
ACCESS TRAVEL TIME
ACCESS ROUTE B
T
T 30 MIN
ACCIDENT
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Real time traffic management
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Forecasting quality
Traffic Detection Historical Data Base
AIMSUN ONLINE Simulations Data Base
Simulated Traffic Data
Real Traffic Data
Comparison
Quality Indicators
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The Singapore case
SCATS adaptive control plans
4650 kilometres, 21131 secciones, 5580
intersecciones, 274'578 veh/h
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The Madrid case
M-30
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The Network
567 kilometres, 3259 secciones, 1224
intersecciones
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Model validation
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Safety strategy calle 30
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Strategies evaluation
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Operator view
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Comparison example
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Meso or Micro
OR
MESOSCOPIC
MICROSCOPIC
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Future Trend Hybrid Meso/Micro Simulation
LARGE URBAN OR METROPOLITAN AREA ? Mesoscopic
Model
SUBAREA2 (Problem Network) ? Detailed Microscopic
Model
Micro
SUBAREA1 (Problem Network) ? Detailed Microscopic
Model
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Thank you

• Pg. de Gràcia 1208007 BarcelonaSPAINTel.
  (34) 933 171 693Fax. (34) 933 171 716mail
  info_at_aimsun.com
• web www.aimsun.com