Project: DIADEM Development of Integrated Assignment & Demand Modelling

Reference: H1O7B

Last update: 24/05/2004 15:13:12


This project will review all literature on flexible demand modelling techniques, as well as develop a software package suitable for use in congested networks. A significant proportion of this project will be to test a robust software package, with suitable documentation, to produce assignments using elasticity-based methods.


Transport models are becoming more complex because of the need to reflect the congestion on the road networks and the reaction of drivers who may re-time their trips to avoid congestion. Long-term studies have identified issues around the elasticities of traffic assignments and the methods to adjust traffic matrices.


MVA Systematica
MVA House, Victoria Way, Woking, Surrey, GU21 1DD
+44 (0)1483 728051

Contract details

Cost to the Department: £285,250.00

Actual start date: 22 January 2001

Actual completion date: 30 April 2004


Background Papers to Diadem
Author: Mott Macdonald
Publication date: 01/09/2003
Source: DfT Website
More information:

Summary of results

  1. The research showed how to improve supply and demand convergence and established the need for significant improvements relative to historic convergence procedures.