Question to the Department for Transport:

To ask His Majesty's Government, further to the Written Answer by Lord Hendy of Richmond Hill on 16 October (HL10758), whether the Green Book Guidance and the Transport Analysis Guidance make allowance for large scale delays in the commissioning of new and road improvement schemes, and accidents associated with those schemes.

Transport appraisals informed by HM Treasury’s Green Book and DfT’s Transport Analysis Guidance (TAG) take account of delays in the commissioning of road schemes via a few mechanisms.

As set out in the Transport Business Case Guidance, the established business case process is designed to be flexible, and responsive to evidence that emerges throughout the duration of the proposal’s development. This includes reflecting emerging evidence on project timelines in the analysis that informs the economic dimension.

TAG contains detailed guidance on setting an appropriate appraisal period, running from the scheme opening date. We intend to include plans to expand this guidance to make it more helpful for promoters assessing potential changes in opening dates, as part of our upcoming Appraisal, Modelling and Evaluation Strategy (AMES), to be published early next year.

Where scheme delivery is expected to take longer, TAG also contains advice on how to appraise impacts to existing transport users that occur during the construction of schemes.

Regarding accidents, TAG contains extensive guidance and tools to assist promoters in assessing the likely accident and safety impacts associated with a scheme. As with all TAG methods, these approaches are kept under review, and updated with robust evidence where appropriate.