DIADEM

DIADEM is variable demand transport modelling software developed by Mott MacDonald on behalf of the Department for Transport. It stands for Dynamic Integrated Assignment and DEmand Modelling.

The purpose of DIADEM is to provide a straightforward way to implement a variable demand model consistent with Units 3.10.1 to 3.10.4 of the WebTAG guidance .

The main demand model used in DIADEM is an incremental hierarchical logit model of the following demand responses:

  • Trip frequency
  • Time period choice
  • Mode choice
  • Destination choice/distribution

Travel times and other costs are provided by a third party traffic assignment model. Currently DIADEM can be used with the CONTRAM and SATURN packages.

DIADEM is also designed to achieve convergence between supply and demand, as specified in WebTAG Unit 3.10.4 .

For more information about the technical details behind DIADEM please download the user manual or contact us if you have a specific question.

The current version of DIADEM is 3.1:

  • DIADEM engine v3.1.14
  • DIADEM GUI v3.1.13

News

Includes information on latest releases, user group meetings, training and DIADEM developments.

Purchasing DIADEM

Information on types of use and cost of purchasing DIADEM.

User manuals

Different versions of the user manuals are available depending on whether you use SATURN or CONTRAM.

Frequently asked questions

The most frequently asked questions about DIADEM.

Downloads

Information on DIADEM downloads.

Contact

Contact details for the DIADEM help desk.

Archived content

The following content is available from the Department for Transport web archive .