Question to the Department for Transport:

To ask His Majesty's Government, further to the Written Answer by Lord Hendy of Richmond Hill on 27 October (HL11341), what delays faced by road users during  the works were factored into the calculations of overall reduction in congestion and journey times.

In line with the Department for Transport’s Transport Analysis Guidance (TAG) Unit A1.3, User and Provider Impacts, costs to existing transport users due to the construction of a road investment scheme are recorded in the appraisal. The impact of delays during construction and maintenance are estimated using the same transport models used to predict the overall traffic effects of the scheme. Bespoke software packages, as described in TAG, are used to value the delays to transport users using standard economic parameters.

The Transport Economic Efficiency (TEE) table, produced for all road investment schemes, allows for the user delays during construction and maintenance to be recorded alongside the travel time benefits of the road investment scheme, to ensure that the economic appraisal accounts for both the benefits and disbenefits for users of the road investment scheme.