Short Term Framework

• SimMobility Short-term (ST) is an integrated microscopic mobility simulator. By integrated, we mean the nature of its models, input/outputs, simulated components and code-base that is specifically design to be integrated within a multiscale agent- and activity-based simulation platform. By microscopic, we mean that both the demand (agents and its vehicles) and the supply (their movement on the network) are microscopic. Finally, by mobility, we emphasis on the multimodality of current and the need for a capability of flexible simulation of innovative transportation services such as on-demand and smart mobility solutions.
• SimMobility ST aims at simulating the movement of agents (traffic, transit, pedestrians and goods) and the decisions and operation of control centers, within one day. It also allows for a modular integration of specific behaviors associated with new mobility services and transportation modes. Its modelling framework and system architecture are presented here in Wiki, reporting its successful calibration for Singapore and its use in several mobility applications.

Modeling & Framework of Short-term

• 1. Main modules
  
  • 1.1 Microscopic Traffic Simulator
    
  • 1.2 Control and Operation Systems
    
  • 1.3 Communication Network Simulator
    
• 2. Travel Demand
  
• 3. Agents Movement and Roles
  
• 4. Reaction Time
  
• 5. Acceleration Model
  
  • 5.1 Acceleration Decision
    
  • 5.2 Acceleration Regimes Description
    
  • 5.3 Auxiliary Functions
    
  • 5.4 Acceleration Parameter Definition
    
• 6. Lane-changing Model
  
  • 6.1 Vehicle State and Regime Variables
    
  • 6.2 Lane Choice Model
    
  • 6.3 Executing the Lane Change
    
  • 6.4 Auxiliary Functions
    
  • 6.5 Gap Model
    
  • 6.6 Lane Changing Parameters
    
• 7. Intersection Behavior
  
• 8. Route-choice Behavior
  
• [9. Parking supply] -> not implemented!
  
  • 9.1 In/Output
    
  • 9.2 Parking infrastructure
    
  • 9.3 Parking driving behavior
    
• 10. Vehicle loading model
  
• 11. Incident implementation in SimMobilityST
  

Calibration of SimMobility Short-term

• Recent changes / Issues on calibration * ST enhancement

  • Vehicle loading model (On-going, https://github.com/smart-fm/simmobility-prod/wiki/10.-VehicleLoadingModel) * Algorithm change
  • Normalization of parameters
  • Gradient approximation * Network correction
  • Additional turning restriction in reality (Done)
  • Discrepancy in terms of the number of lanes (Done)
  • Additional link in reality (Done)
  • Signal issue (Signal phase discrepancy, Signal phase issue (https://github.com/smart-fm/simmobility/issues
  • Intersection design
  • U-turn inside ext. CBD (Partially Done) For more detail, see: https://github.com/smart-fm/simmobility/issues/431. * Visualizer (On-going)
  • Condition triggering segment gridlock
  • Initial parameters validation (DB, RC)

• 1. Calibration Framework and Implementation

• 2. Parameters to be tuned

• 3. Study site and Data

• 4. Calibration result

• 5. Execution procedure