TAG unit A5-4 marginal external costs
Information on the marginal external costs method in transport modelling and appraisal.
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Information on the marginal external costs method, which is based on the change in various external costs such as congestion, air pollution, noise, infrastructure and accidents. The marginal external costs method is used to estimate the benefits of reducing congestion in the absence of a multi-modal model.
The previous version of this guidance was published in NovemberMay 20212023.
TAG provides information on the role of transport modelling and appraisal, and how the transport appraisal process supports the development of investment decisions to support a business case.
Updates to this page
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TAG unit A5-4 updated.
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Added forthcoming change: appraisal data update.
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TAG unit A5-4 updated.
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Added forthcoming change: spring 2023 data book and guidance updates.
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Forthcoming change note removed.
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Added forthcoming change notes.
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Updated guidance.
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First published.