Guidance

TAG unit A5-4 marginal external costs

Information on the marginal external costs method in transport modelling and appraisal.

Documents

Forthcoming change note to TAG unit A5-4 marginal external costs, November 2022

Details

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 the used to estimate the benefits of reducing congestion in the absence of a multi-modal model.

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.

Published 29 May 2020
Last updated 3019 NovemberOctober 2022 + show all updates
  1. Forthcoming change note removed.

  2. Added forthcoming change notes.

  3. Updated guidance.

  4. First published.