Transport in United Kingdom

The transport systems in UK are the responsibility of each individual country ( England -london city-, Scotland, Wales and Northern Ireland). The English transport network is the responsibility of the UK Department for Transport (which also has responsibility for transport matters in Scotland, Wales and Northern Ireland which are not devolved.) In Scotland, the Scottish Government's Enterprise, Transport and Lifelong Learning Department is responsible for the Scottish transport network with Transport Scotland being the Executive Agency that is accountable to the Cabinet Secretary for Finance and Sustainable Growth.
A radial road network of 46,904 km of main roads is centred on London, Edinburgh, Cardiff and Belfast, whilst, in Great Britain, a motorway network of 3,497 kilometres is centred on Birmingham, Manchester and London. There are a further 213,750 km of paved roads.
The National Rail network of 16,116 km in Great Britain and 303 route km in Northern Ireland carries over 18,000 passenger trains and 1,000 freight trains daily. Urban rail networks are well developed in London and other cities.

Heathrow Airport is the world's busiest international airport and, being an island country, the UK has a considerable number of sea ports.
The Department for Transport states that traffic congestion is one of the most serious transport problems and that it could cost England an extra £22 billion in wasted time by 2025 if left unchecked. According to the government-sponsored Eddington report of 2006, congestion is in danger of harming the economy, unless tackled by road pricing and expansion of the transport network.