Research and analysis

Congested values of travel time (CVTT) in transport modelling

The research undertaken in applying congestion multipliers to values of travel time saving (VTTS).

From:
Department for Transport
Published
14 April 2023

Documents

Congestion dependent values of time in transport modelling: further PRISM testing

PDF, 6.51 MB, 143 pages

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Congested values of travel time: re-analysis of the 2014 to 15 SP study

PDF, 1.99 MB, 79 pages

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Details

Two reports covering the research undertaken in applying congestion multipliers to values of travel time saving (VTTS).

The first report investigates the use of congested values of travel time (CVTT) in model forecasting and scheme appraisal. It develops a ‘proof of concept’ using the policy-responsive integrated strategy model (PRISM) of the West Midlands Combined Authority.

The second report undertakes a re-analysis of a 2014 to 2015 UK values of travel time (VTT) study to address concerns around the robustness of the UK congestion multipliers estimated at the time. In doing so, the report:

  • analyses how CVTT values differ by journey purpose and length
  • reviews the approaches to deriving UK ‘headline VTT’
  • considers the need for, and possible approaches to, a new CVTT study where respondents are re-surveyed and values are updated
Published 14 April 2023

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