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Developments in Railplan Crowding Assessment

Developments in Railplan Crowding Assessment. by Caroline Moore and Clifford Chow Principal Transport Planners. BACKGROUND. relief of crowding provided by a scheme extent of new development/employment derived from a scheme. CORDON ANALYSIS.

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Developments in Railplan Crowding Assessment

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  1. Developments in RailplanCrowding Assessment by Caroline Moore and Clifford Chow Principal Transport Planners

  2. BACKGROUND • relief of crowding provided by a scheme • extent of new development/employment derived from a scheme

  3. CORDON ANALYSIS • capacity (supply) and flows (demand) around cordons with and without scheme • cordon defined geographically, not necessarily where crowding is at its worst • underestimated problem by averaging demand and supply • unable to differentiate between different areas within the cordon • unable to identify geographic distribution of affected passengers

  4. MAIN AREAS OF INTEREST

  5. A NEW APPROACH • based on select link analysis • compute crowding ratio, defined as “flows / PGC capacity”, on each link • identify links where crowding exceeds a defined threshold • produce a matrix of affected passengers for the defined threshold • analyse results in tabular or graphical forms

  6. LOCATION OF CROWDED LINKS

  7. Proportion of Destination Tripends Affected by Crowding (AM peak hour) OUTPUTS

  8. Percentage of Destination Trips Affected Base Year Percentage of Destination Trips Affected Future Year - Without Scenario Percentage of Destination Trips Affected Future Year - With Scenario OUTPUTS

  9. INITIAL STRENGTHS AND WEAKNESS • link between most crowded parts of the network and level of crowding affecting specific areas • enables comparison between different areas • cannot deduce how badly affected the passengers are

  10. REFINEMENT • importance of level of crowding over whole trip • time based analysis (uncrowded in-vehicle time) • analyse results in tabular or graphical forms

  11. Proportion of Pass-mins on Crowded Links (AM peak hour) OUTPUTS

  12. Percentage of Destination Trips Affected Base Year Percentage of Destination Trips Affected Future Year - Without Scenario Percentage of Destination Trips Affected Future Year - With Scenario FURTHER POTENTIAL REFINEMENTS • impact of scheme sensitive to defined threshold • maximum feasible level of loading

  13. FURTHER POTENTIAL REFINEMENTS • impact of scheme sensitive to defined threshold • maximum feasible level of loading • time distributions with and without the scheme

  14. FURTHER POTENTIAL REFINEMENTS • impact of scheme sensitive to defined threshold • maximum feasible level of loading • time distributions with and without the scheme • number of jobs to be created

  15. CONCLUSION • a step forward • of use to TfL and planning authorities

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