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PRISM-West Midlands


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Future PRISM updates:

The PRISM model is being re-based to 2016.This model update will produce new base matrices from up-to-date information and is expected to be available at the end of the year.

As this is an extensive model update, for the most up to date progress information please contact Mott MacDonald.


 

PRISM 4.8 Ongoing:

Following the release of NTEM 7.2 data (fixing a number of issues in NTEM 7.0), the PRISM model will be updated to incorporate these changes. All other aspects of the PRISM system will remain unchanged.


 

PRISM 4.7 Complete:

PRISM has recently undergone an update. This update incorporates NTEM 7.0 and the November 2016 WebTAG databook values for VOT/VOC. Convergence was also looked at, and so some highway network changes have been adopted. Base year matrices have been tested for validation (but not re-calibrated), and pass rates are sufficiently similar to PRISM 4.5.

This new update will allow for better converged results from PRISM with more reasonable run-times, which will benefit future applications within the West Midlands.


 

PRISM 4.6 Complete:

PRISM has recently undergone an update focusing on convergence. In particular the highway assignment algorithms have been optimised.
The base year matrices have been tested for validation (but not re-calibrated), and pass rates are sufficiently similar to PRISM 4.5.


 

PRISM 4.5 Complete:

PRISM has recently undergone an extensive update, key changes include:

  • Improvements to the public transport assignment model,
  • Observed signal timing data,
  • Census 2011 journey to work Matrix data,
  • use of VISUM15,
  • improved representation of motorway junctions.

The Base year matrices have been re-calibrated and validated to a 2011 base year.

The improvements result in increased model convergence and ensure that PRISM remains a fundamental tool for the West Midlands to use in its strategic policy, planning and investment decision making.

 


 

European Transport Conference 2014 :

PRISM team members presented two papers:

'Structural similarity in OD matrices – further investigations' will follow on from the Pollard et al. paper last year, detailing the further work that has gone into comparing OD matrices and practical applications.

'Merging Traditional and Big Data sources to create a practical OD matrix' will explore how the PRISM base matrices where constructed using GPS and RSI survey data and overcoming the difficulties in merging these different sources of data.


 

European Transport Conference 2013 :

In Frankfurt, in October 2013, PRISM team members presented three papers related to the PRISM Refresh findings: “Estimating signal timings for assignment models from junction flow and delay data”, “Comparing the quality of OD matrices in time and between data sources” and “Adding escort travel as a separate trip purpose - example for the West Midlands region in the UK”.

These papers, and ones from previous conferences are available in our Downloads section.


 

PRISM Refresh Complete:

PRISM 2011 is now live!
This state-of-the-art transport model of the West Midlands has been undergoing a 2-year transformation to be able to match the travel choices of the West Midlands population seen in 2011 and introduce some new key features, including: detailed junction modelling; queuing and flow metering; pseudo-activity-based demand modelling; and a public transport model partnership with Centro. PRISM can forecast up to 20 years into the future and is a fundamental tool for the West Midlands to use in its strategic policy, planning and investment decision making.


 

PRISM website update:

A major update to the PRISM website is in progress. Please bear with us while we make these improvements. For any queries or suggestions, please contact tim.pollard@mottmac.com


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