Great Western Railway services which include high-speed trains to London Paddington and local, regional and CrossCountry trains. Bristol Parkway, north of the city centre, has high-speed Great Western Railway services to Swansea, Cardiff Central and London Paddington and CrossCountry services to Birmingham and east of Northern England. A limited service to London Waterloo, via Clapham Junction, from Temple Meads is operated by South Western Railway and there are scheduled coach links to most major UK cities. Bristol's principal surviving suburban railway is the Severn Beach Line to Avonmouth and Severn Beach. Although Portishead Railway's passenger service was a casualty of the Beeching cuts, freight service to the Royal Portbury Dock was restored from 2000 to 2002 with a Strategic Rail Authority rail-freight grant. The MetroWest scheme, formerly known as The Greater Bristol Metro, proposes to increase the city's rail capacity including the restoration of a further of track on the line to Portishead (a dormitory town with one connecting road), and a further commuter rail line from Bristol Temple Meads to Henbury, on an existing freight line. Following numerous delays, the two lines are due to be opened in 2026. Roads The M4 motorway connects the city on an east–west axis from London to West Wales, and the M5 is a north–south west axis from Birmingham to Exeter. The M49 motorway is a shortcut between the M5 in the south and the M4 Severn Crossing in the west, and the M32 is a spur from the M4 to the city centre. The Portway connects the M5 to the city centre, and was the most expensive road in Britain when opened in 1926. As of 2019, Bristol is working on plans for a Clean Air Zone to reduce pollution, which could involve charging the most polluting vehicles to enter the city centre. Several road-construction plans, including re-routing and improving the South Bristol Ring Road, are supported by the city council. Private car use is high in the city, leading to traffic congestion costing an estimated £350million per year. Bristol allows motorcycles to use most of the city's bus lanes and provides secure, free parking for them. Public transport Public transport in the city consists primarily of a First West of England bus network. Other providers are Abus, Stagecoach West, Stagecoach South West and until its sale to Stagecoach West, Wessex Bus. Bristol's bus service has been criticised as unreliable and expensive,