Download eBook for Free

FormatFile SizeNotes
PDF file 0.5 MB

Use Adobe Acrobat Reader version 10 or higher for the best experience.

PRISM West Midlands is a travel demand model forecasting system which was developed by RAND Europe and Mott MacDonald on behalf of the seven metropolitan districts in the West Midlands Metropolitan Area, the Highways Agency and Centro. The model system is required to be responsive to a wide range of policy levers, and to assess the impact of different policies on specific segments of the population. The original model development was undertaken between 2002 and 2004, with a base year of 2001, and a number of enhancements have been made to the model system since 2004, including adding incomes to the model, and an improved treatment of cost sensitivity and updating the base year to 2006.

In the PRISM Refresh project, the demand and network models in PRISM have been more fundamentally updated to reflect a 2011 base year. RAND Europe's role was to re-estimate the demand models using household interview data collected between 2009 and 2012, and deliver to Mott MacDonald an operational demand model implementation that can run together with the network models in the overall PRISM model system. The work was again undertaken on behalf of the seven metropolitan districts in the West Midlands Metropolitan Area, the Highways Agency and Centro.

This report documents the development of the updated travel frequency and car ownership models. Frequency models have been developed for 14 travel purposes. Travel frequency is predicted by applying two linked sub-models to predict the total amount of travel an individual makes on an average weekday in school term time. The first sub-model predicts whether an individual makes any travel, the second sub-model predicts how much travel will be made given that an individual makes at least some travel.

Table of Contents

  • Chapter One


  • Chapter Two

    Frequency model specification

  • Chapter Three

    Home-based frequency models

  • Chapter Four

    Non-home-based frequency models

  • Chapter Five

    Car ownership models

Research conducted by

The research described in this report was prepared for Mott MacDonald and conducted by RAND Europe.

This report is part of the RAND Corporation Research report series. RAND reports present research findings and objective analysis that address the challenges facing the public and private sectors. All RAND reports undergo rigorous peer review to ensure high standards for research quality and objectivity.

This document and trademark(s) contained herein are protected by law. This representation of RAND intellectual property is provided for noncommercial use only. Unauthorized posting of this publication online is prohibited; linking directly to this product page is encouraged. Permission is required from RAND to reproduce, or reuse in another form, any of its research documents for commercial purposes. For information on reprint and reuse permissions, please visit

The RAND Corporation is a nonprofit institution that helps improve policy and decisionmaking through research and analysis. RAND's publications do not necessarily reflect the opinions of its research clients and sponsors.