J-Sim Urban Traffic Simulator

1. 1 J-Sim Urban Traffic Simulator J-Sim based, XML using grafical and console simulation tool. David Hartman ZČU-FAV-KIV JUTS JSim Urban Traffic Simulator

2. 2 Introduction • Goals • Road model definition • Simulation map definition • Results collecting • XML load JUTS JSim Urban Traffic Simulator

3. 3 Goals • Simulation properties • global traffic networks consideration • detailed dynamic simulation • Simulation entities • from data configurable • easy but good graphical output JUTS JSim Urban Traffic Simulator

4. 4 Road model definition • Microscopic models • Mezoscopic models • Macroscopic models JUTS JSim Urban Traffic Simulator

5. 5 Microscopic models • Each vehicle consideration • system entities are objects with specific decision-making • detailed entities interactions simulation • Advantages and disadvantages • difficult implementation and tune • most realistic JUTS JSim Urban Traffic Simulator

6. 6 Mesoscopic models • No specific vehicle consideration • vehicles making decision itself but like pattern (no objects) • interactions are on characteristic level • Advantages and disadvantages • better interactions tunning • attributes of vehicle not consider JUTS JSim Urban Traffic Simulator

7. 7 Macroscopic models • Vehicle flow consideration • vehicle distribution function • flow equation • Advantages and disadvantages • microscopic details not included • Lot of calculations but fast • only for global traffic network JUTS JSim Urban Traffic Simulator

8. 8 Cellular Automata model • Definition • microscopic model; detailed interactions • Nagel-Schreckenberg(NaSch); moving rules • Lane Division JUTS JSim Urban Traffic Simulator

9. 9 Basic minimal NaSch rules • (lane change decision and making) • Acceleration vn -> min(vn+1;vmax) • Break vn -> min(vn, gn+1) • Randomization vn -> max(vn-1,0) [p] • Move xn -> xn + vn JUTS JSim Urban Traffic Simulator

10. 10 Model extensions • VDR model • Velocity Dependent Randomization • probability is function of gab,speed,etc. • Anticipation models • consider leading vehicle attributes at speed adaptation JUTS JSim Urban Traffic Simulator

11. 11 JUTS road model • VDR and anticipation types based • Cell 2.5m moving refresh period 1s • Vehicle length consideration • Leading head algorithm JUTS JSim Urban Traffic Simulator

12. 12 Leading head algorithm • Head makes footmarks and other pieces are tracking • Easy lane change and map moves JUTS JSim Urban Traffic Simulator

13. 13 Simulation map definition • XML loadable • Global system definition with structured approach • Easy collection of data JUTS JSim Urban Traffic Simulator

14. Roads Crossroads Roundabouts Parkings Generators Terminators 14 Map segments JUTS JSim Urban Traffic Simulator

15. 15 Segments connection • Connection places • general segment connection • sending vehicles through • Direction plus path • places are targets • vehicle path aiming JUTS JSim Urban Traffic Simulator

16. 16 Connection scheme JUTS JSim Urban Traffic Simulator

17. 17 Road segment • Traffic Lanes shifts • Rail lanes • Separation barrier • Signs container • Acceptors and emitters JUTS JSim Urban Traffic Simulator

18. 18 Crossroad segment • Crossroad places • Vehicle jumping • Lights Container JUTS JSim Urban Traffic Simulator

19. 19 Roundabout segment • Round road • Lane property • Less objects JUTS JSim Urban Traffic Simulator

20. Generating vehicles Sending to network Accepting vehicles from network Finalizing process 20 Generators and terminators JUTS JSim Urban Traffic Simulator

21. 21 Parking segment • Storage for vehicles • Capacity and occupancy • Vehicle are not active inside JUTS JSim Urban Traffic Simulator

22. 22 Moving process • Segment server calls update function • Update function calls model rules for all heads of vehicles. • Vehicles proceed on of their moving methods according to actual place JUTS JSim Urban Traffic Simulator

23. 23 Traffic Lights • Static vs. dynamic • Deep detail • Signal program • Phase schema • Phase transitions • Signal groups JUTS JSim Urban Traffic Simulator

24. 24 Result collecting • Special collector objects • Vehicle movements, traffic characteristic • Cyclic update; time elements • Send output to stream in XML • For each vehicle, for each step • Stream redirections JUTS JSim Urban Traffic Simulator

25. 25 XML structure • Project file definitions • Map definition • Time progress definition • Initialization definition • Project file outputs • Vehicles moves • Characteristic JUTS JSim Urban Traffic Simulator

26. 26 XML data loading • XML define objects • Connections with ID • Like structure, like loading process; all objects XML definable JUTS JSim Urban Traffic Simulator

27. 27 Time progress objects • Timed value generators • Tree structure; time axis • Blocks are referenced • Probability trends • For changing probability during time • Same tree structure JUTS JSim Urban Traffic Simulator

28. 28 Application • Two regimes of running • Offline • Online • Graphical definitions • Segments • Vehicles movements JUTS JSim Urban Traffic Simulator

29. 28 Future expectations • Simulation features • Model global validation • Connection with other system (Lights strategies,…) • Map features • Map XML editor • GIS or other map data using JUTS JSim Urban Traffic Simulator

30. 29 The End JUTS JSim Urban Traffic Simulator