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Background

The implementation and effects of recent updates to the crowding assignment macro within the Docklands Public Transport Model (DPTM) Michael Swiderski 23 February 2010. Background. What is DPTM? Recent proposals for changes to strategic public transport modelling in London;

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Background

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  1. The implementation and effects of recent updates to the crowding assignment macro within the Docklands Public Transport Model (DPTM) Michael Swiderski23 February 2010

  2. Background • What is DPTM? • Recent proposals for changes to strategic public transport modelling in London; • Incorporation of INRO modifications to assignment procedures • Revised crowding calculation • Crowding on the bus network • Implemented in DPTM as part of latest re-validation (against 2007 data)

  3. Update #1 - INRO modifications • Dual aims of modifications; • Improved model efficiency • Replacement of secant method with Muller method • Module 1.11 only used at end of macro for storing data • Streamlining of some of the macro instructions • Improved model accuracy • Weighting of results of all iterations • Impedance matrix updated at each iteration • Updated calculation of relative gap calculated at each iteration • Use of relative gap as stopping criterion

  4. Effect of INRO Modifications – Demand on Network

  5. Effect of INRO Modifications – Demand on Network

  6. Effect of INRO Modifications – Demand on Network – Future Year

  7. Effect of INRO Modifications – Demand on Network – Future Year

  8. Effect of INRO Modifications – Network Statistics – Future Year

  9. Effect of INRO Modifications – Network Statistics – DLR Stratford International

  10. Update #2 - Revised crowding calculation • Quadratic crowding functions • Formula: CF = a + b X +cX * X if X>-b/2c = 0 if X<=-b/2c Where: CF is crowding factor to be applied to the in-vehicle time X is (train load – seats) / (crush load – seats) a, b, c are parameters calibrated for each vehicle type • a, b and c parameters derived through curve-fitting exercise which assumed 5 pax/sqm • steeper LUL/NR crowding curves compared to “classic” Railplan • 12 separate crowding curve functions based on ratio of seating to total standing capacity

  11. Quadratic and classic Railplan crowding functions - LUL

  12. Quadratic and classic Railplan crowding functions - NR

  13. Effect of revised crowding calculation – LUL crowding penalties

  14. Effect of revised crowding calculation – LUL network demand

  15. Effect of revised crowding calculation – DLR crowding penalties

  16. Effect of revised crowding calculation – DLR network demand

  17. Effect of revised crowding calculation – NR crowding penalties

  18. Effect of revised crowding calculation – NR network demand

  19. Effect of revised crowding calculation – Bus network demand

  20. Effect of revised crowding calculation – Network Statistics

  21. Update #3 - Incorporation of crowding on bus network • Included as part of revised quadratic crowding calculation • Bus crowding calculated separately from LUL/DLR/NR • Bus demand profile assumed same as LUL • Bus supply profile assumes uniform distribution of services across AM Peak

  22. Effect of bus crowding – LUL network demand

  23. Effect of bus crowding – DLR network demand

  24. Effect of bus crowding – NR network demand

  25. Effect of bus crowding – Bus network demand

  26. Effect of bus crowding – Network statistics

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