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Overview of Four Scopes in Transportation Assignment Models

This document explores four key scopes in transportation assignment models: Logit, AssignmentToday, LUTI, and other models and appraisals. It details the process of transportation assignment, including trip generation, trip distribution, modal split, and route selection in a network. The analysis covers supply and demand interactions, user equilibrium, system optimum, and graphical illustrations of optimization approaches. Additionally, it examines public transport assignment and various route choice modeling strategies. Understanding these concepts is essential for improving transportation planning and reducing congestion.

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Overview of Four Scopes in Transportation Assignment Models

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  1. Assignment

  2. Where are we? There are fourscopes 1. Logit 2. AssignmentToday! 3. LUTI 4. Othermodels and appraisal

  3. Where are we? There are fourscopes 1. Logit 2. AssignmentToday! 3. LUTI 4. Othermodels and appraisal MostlyMonday Dec 9

  4. Remember the four steps • Trip generation • Trip distribution • Modal split • Assignment • Which route on a network? • Traffic flow per link, transit stop etc

  5. Car assignmentnetwork definition

  6. From the real world…

  7. … to a network representation

  8. Definitions

  9. Howdowechoose route?

  10. Howdopeoplechoose route?

  11. Volume-delayfunction Severalfunctional forms, see 10.1.3 For instancefamous ”BPR” used in the US

  12. All-or-nothing • Use ”shortestpath” (moregenerally, the one with leastgeneralizedcost) • Allocate all demand to shortestpath • May not be the shortestanymore

  13. Supply and demand and equilibrium?

  14. Supply and demand interaction

  15. Equilibrium What would make people change route? •User equilibrium (Wardrops 1st principle): -All used routes will take the same time -No unused route will be take less time •System optimum -Minimum total travel time The difference is known as Price of Anarchy

  16. Graphical illustration

  17. An optimization approach

  18. A paradox

  19. Limitations

  20. Public transport assignment(transit assignment)

  21. Definitions

  22. Factors of route choice for transit

  23. How to model?

  24. How to model?

  25. Different possiblemodels

  26. Line choicemodel

  27. Strategychoicemodel

  28. Example

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