The SoCoMMS Model

1. The SoCoMMS Model Paul Read Dan Jones

2. The Presentation • Outline of the Study • The Modelling Framework • Accessibility Model

3. What is SoCoMMS? • One of the Government’s Multi-modal studies • Study area from Southampton to Thanet • Examined issues across all modes • Developed a Transport Strategy for input into the South East Regional Strategy

4. Study Area

5. The Need for Models • to understand current problems • to understand future impacts of growth, land use change and role changes (visions) • assess implications of alternative transport packages and strategies • providing objective outputs for use in appraisal - efficiency, environment, safety, regeneration, accessibility, integration

8. Strategic Corridor Model • Multi-modal model • four stage model • based on trip data from existing models • built in EMME/2 format • trip purpose segmentation (also freight) • outputs to appraisal

9. Networks • Wide area of coverage • highway network • rail network • bus services (interurban) • ferry services

10. Trip Purposes Private Vehicle, Public Transport • home based work • business • other Freight • light goods • other goods

11. Other Parts to the Strategic Model • Forecasting Procedure • Distribution Model • Mode Choice Model • Induced effects • Trip suppression

12. Uses of Strategic Model • Rail service changes • Rail infrastructure • Bus service changes • Demand Management (tolls, parking) • Road traffic reduction • Land use changes • Highway measures

13. Strategy Development Based on findings of component tests further work undertaken to develop emerging strategy. This is based around a starting combination, with components being added / subtracted so as to determine contribution that each makes to overall package

14. Alternative Road Alternative Coercion Additional Roads More Coercion Less Roads Less Coercion Start No Persuasive Measures More Local PT Additional Rail Alternative Local PT Alternative Rail Less Rail Less Local PT

15. Alternative Road Alternative Coercion Additional Roads More Coercion Less Roads Less Coercion Start No Persuasive Measures More Local PT Additional Rail Alternative Local PT Alternative Rail Less Rail Less Local PT

16. Alternative Road Alternative Coercion Additional Roads More Coercion Less Roads Less Coercion Start No Persuasive Measures More Local PT Additional Rail Alternative Local PT Alternative Rail Less Rail Less Local PT

18. Increases in rail usage

19. Changes in Traffic Patterns

20. Key Outputs • Network performance • Economic evaluation • Environmental analyses • Impact on regeneration – importance of accessibility

21. Why the need for an Accessibility Model? • Multi-criteria analysis • Impact of transport on deprivation and employment • Localised impacts  small zones • Significant employment outside region  wide area coverage

22. Overview of Accessibility Model • Two models: highway and public transport • Large study area, small zones (5362) • Cannot use usual methods (licence) • Use of EMME/2 modules 5.34/5.35 • Networks and travel times from 6 ‘source’ models (3 highway, 3 PT)

23. Procedures – highway • Prepare network • Prepare zones and connect to network • Build paths through the network • Calculate accessibility measures • Loop through 2) to 4) for all origins • Transfer results to GIS

24. Prepare network • Assign and skim source models (3) • Dump networks and times • Reformat to EMME/2 batch-in • Renumber nodes to avoid duplicates • Batch-in to EMME/2 (times in ul1) • Identify join lines, delete overlaps • Connect networks along join lines • Check!

27. Procedures – highway • Prepare network • Prepare zones and connect to network • Build paths through the network • Calculate accessibility measures • Loop through 2) to 4) for all origins • Transfer results to GIS

28. Connect ‘zones’ to network • Module 5.34: process one OD at a time • Create file of zone centres (x,y) • Define: search radius, number of connections • Input file: origin and destination co-ordinates • Batch: one origin, 5362 destinations • Output file: access/egress nodes

29. Procedures – highway • Prepare network • Prepare zones and connect to network • Build paths through the network • Calculate accessibility measures • Loop through 2) to 4) for all origins • Transfer results to GIS

30. Build best paths through the network • Module 5.35: process one OD at a time • Add auxiliary mode to all links (time = ul1) • Define: access/egress speed, parameters • Input file (from 5.34): origin and destination co-ordinates, access and egress nodes • Batch: one origin, 5362 destinations • Output file: best path times

31. Procedures – highway • Prepare network • Prepare zones and connect to network • Build paths through the network • Calculate accessibility measures • Loop through 2) to 4) for all origins • Transfer results to GIS

32. Calculate accessibility measures • Combine travel times and zone data • Inputs: journey times, population and employment data, accessibility function • What measure is required? •  Accessibility function • Step function: e.g. jobs within 30 minutes • Curve: jobs weighted (weight  as time )

36. Procedures • Prepare network • Prepare zones and connect to network • Build paths through the network • Calculate accessibility measures • Loop through 2) to 4) for all origins • Transfer results to GIS

37. Results • Central Hastings A.I. (Jobs) • 2000 Base = 0.44m • 2026 Do Minimum = 0.32m • 2026 Do Something = 0.37m • Plot and analyse further in GIS

42. Summary • Developed a strategic modelling framework • Strategic model used to incrementally develop the strategy • Provided key outputs to decision makers • Accessibility model used to address key issue of regeneration benefits