by the British Chambers of Commerce to be, by virtually every measurement of motorway capacity, well below the capacity of other leading European nations, They give comparative figures for a selection of nations of (units = km/million population): United Kingdom 60, Luxembourg 280, Spain 225, Austria 200, France 185, Belgium 165, Denmark 165, Sweden 165, Netherlands 140, Germany 140, Italy 115, Finland 100, Portugal 80, Greece 45 and Ireland 30. although many other roads are of near motorway standard. National Highways (a UK government-owned company) is responsible for maintaining motorways and trunk roads in England. Other English roads are maintained by local authorities. In Scotland and Wales roads are the responsibility of Transport Scotland, an executive agency of the Scottish Government, and the North and Mid Wales Trunk Road Agent and South Wales Trunk Road Agent on behalf of the Welsh Government respectively. Northern Ireland's roads are overseen by the Department for Infrastructure Roads (DfI Roads). In London, Transport for London is responsible for all trunk roads and other major roads, which are part of the Transport for London Road Network. Toll roads are rare in the United Kingdom, though there are a number of toll bridges. Road traffic congestion has been identified as a key concern for the future prosperity of the United Kingdom, and policies and measures are being investigated and developed by the government to reduce congestion. In 2003, the United Kingdom's first toll motorway, the M6 Toll, opened in the West Midlands area to relieve the congested M6 motorway. Rod Eddington, in his 2006 report Transport's role in sustaining the UK's productivity and competitiveness, recommended that the congestion problem should be tackled with a "sophisticated policy mix" of congestion-targeted road pricing and improving the capacity and performance of the transport network through infrastructure investment and better use of the existing network. Congestion charging systems do operate in the cities of London and Durham and on the Dartford Crossing. In 2005, the Government published proposals for a United Kingdom-wide road pricing scheme. This was designed to be revenue neutral with other motoring taxes to be reduced to compensate. The plans were extremely controversial; 1.8 million people signed a petition against them. Driving is on the left. The usual maximum speed limit is 70 miles per hour (112 km/h) on motorways and dual carriageways. On 29 April 2015, the UK Supreme Court ruled that the government must take