Under the Public Service Management Act 1997, the assignment of responsibilities within a Department is the responsibility of the relevant Secretary General.
I can confirm that in my Department there is responsibility at Assistant Secretary level for sustainable transport policy and investment including walking, cycling and carbon reduction measures as well as public transport policy, services and investment. A key focus within the portfolio is on overseeing the development of public and sustainable transport policy, services and investment, to enable the delivery of transport choice and support change to more sustainable transport options and contribute to carbon reduction.