DfT updates WebTAG guidance

The DfT has announced changes to its WebTAG transport appraisal guidance for release this month. Updates to the parameters and variables used in rail demand forecasting will reflect the recent release of version 6 of the Passenger Demand Forecasting Handbook. New GDP, inflation and average earning outturn data and projections reflect the Office of Budget Responsibility’s Economic and Fiscal Outlook of March. Recommended diversion factors for bus and cycle interventions are being introduced. Updates to aviation appraisal include the treatment of benefits to non-UK residents and the inclusion of journey time impacts.