Project: Agglomeration and the Alpha Density Decay Function

Reference: R224

Last update: 25/11/2013 14:50:35


A report is planned, with the objectives of;
- reviewing the theory and intuition for the effective density measure and the form(s)of the alpha parameter.
- define the appropriate formulation of effective density (with a practical view to DfT appraisal needs);
- estimate the form(s) and likely value(s) of the alpha parameter.
- advise practically on how the findings of the analysis should be incorporated into DfT's appraisal of agglomeration.


To provide an evidenced value for the alpha parameter to allow the productivity impact of transport to be assessed more robustly.


Imperial College of Science Technology and Medicine
Centre for Transport Studies, Department of Civil and Environmental Engineering, London, SW7 2BU
0207 594 6089

Contract details

Cost to the Department: £59,100.00

Expected start date: 01 December 2007

Actual completion date: 21 January 2010

Summary of results

  1. The report provided evidence-based agglomeration parameters as required