Central
UK Central Government is responsible for:
- the construction and maintenance of transport infrastructure in England
- transport safety measures in the country
- cooperating with devolved administrations
- the national agencies for the administration of transport infrastructure: Highways England, the Office of Rail and Road and Network Rail.
Regional
The Scottish Parliament is responsible for:
- primary legislation for the Scottish road network
- the construction of new railways
- the provision of rail service.
Road and rail transport is not a devolved matter in Wales, but the Welsh Parliament is responsible for:
- secondary legislation for the construction and maintenance of railways in Wales
- further transport infrastructure projects in Wales.
The Northern Ireland Assembly is responsible for:
- transport infrastructure planning and road services.
Local
Local authorities are responsible for[1]:
- actions based on governmental legislation
- local planning, local transport infrastructure, detailed planning
- carrying out specific tasks identified in the transport infrastructure programme, funded at regional or national level
- developing local transport strategies, which are related to and interconnected with major transport infrastructure projects. This is specifically the case in Scotland
- adopting local transport plans
- developing local plans for policy implementation.
Responsible ministries/bodies
UK Department for Transport
Devolved governments of the United Kingdom
[1] Local governments are based on statute.
Sources
Department for Transport
Devolved government websites:
Scotland: https://www.parliament.scot/
Wales: https://senedd.wales/en/Pages/Home.aspx
Northern Ireland: https://www.northernireland.gov.uk/