In October 2017 the Department published within its Updated Appraisal Report: Airport Capacity in the South East, details of the estimated surface access trips for both highway and public transport trips for each of the airport expansion options as inputs to its non-flight carbon assessment.
Details of the estimates for annual public transport trips for the Heathrow Airport options are set out in the following table:
Annual public transport trips by passengers and employees at Heathrow, DfT17 central forecasts (millions)
Public transport trips
LHR Extended Northern Runway
LHR Northwest Runway
As part of the surface access requirements in the draft Airports National Policy Statement, Government has specified that any applicant must submit a surface access strategy as part of any Development Consent Order application.