Birmingham. Tracline 65 was an upgraded route with the first guided busway in the UK, as part of an experiment in bus improvement measures by the West Midlands PTE. There was a 600-metre section of guideway on Streetly Road in Erdington, at the northern end of the 65 bus route. It opened in 1984 and closed in 1987. A small number of MCW Metrobus Mark IIs were acquired and fitted with guide wheels. After the trial ended these buses remained in normal service, with the last withdrawn on 26 April 2008.
Edinburgh, Edinburgh Fastlink operated by Lothian Buses. Originally called WEBS, the West Edinburgh Bus Scheme, a group of bus priority improvements that included a 1 mile (1.5 km) section of guided busway.
Stenhouse - Broomhouse, opened in December 2004, designed to be utilised for Line 2 of the Edinburgh Tram Network. In January 2009 it closed to enable conversion, with the two services using the guideway being re-routed.
Thames Gateway, Fastrack, unguided with sections of segregated running, opened in phases in concert with planned local development. Operated by Arriva Southern Counties using standard buses, with an upgrade to Streetcar-type vehicles in future.
The Luton to Dunstable Guided Busway runs between Luton Airport and Houghton Regis via Dunstable following the Dunstable branch line, which closed in 1989, running parallel to the A505 (Dunstable Road) and A5065 (Hatters Way). t runs for 6.1 miles, of which 4.8 is guided track with a maximum speed of 50mph. The £80 million scheme opened in September 2013.
St Ives Park & Ride - Milton Road, Cambridge: construction begun January 2007; was due to open in February 2009  but heavily delayed. The service finally opened to traffic on Sunday 7 August 2011.
Leigh-Salford-Manchester Bus Rapid Transit, from Leigh (one of the largest towns in Great Britain without a railway station) to Manchester via Salford. The 14-stop scheme makes partial use of a former railway line to form a 4 miles (7 km) guided busway together with pedestrian, cycle lane and bridleway between Leigh, Tyldesley, and Ellenbrook relieving heavy congestion, it will then join the East Lancs Road with the construction of a bus lane where none is present. A Park and Ride site will be constructed where the road reaches the M60 then the bus will continue along the road through Salford and into Manchester along a total of 9 miles (15 km) of segregated bus lane. The scheme will be 80% segregated from highway along its length and utilise a Trambus hybrid fleet. The scheme is costed at £30m for the guided busway and £76m for the total project. Road junction works began in late 2011 and it was originally due to open in spring 2013, but major works were delayed as finance was diverted to more urgent projects and it will not now begin construction until 2013 and open in 2015. It will form part of the wider Manchester Quality Bus Corridor (Manchester QBC) and Cross City Bus network.
Bristol: Bristol City Council in conjunction with the West of England Partnership is proposing routes from Ashton Vale to Temple Meads, the North Fringe of Bristol to Hengrove Park, and the A370 Long Ashton bypass to Hengrove Park.
Belfast: Since 2008 Belfast has been formally exploring the idea of a rapid-transit system. This quickly settled down to be a high-quality bus-based system, with modern vehicles with a tram-like feel with off-vehicle ticketing and fast journey times that hinge on the use of a dedicated traffic lane that is not used by general traffic. The ultimate ambition seems to be for routes running from the city centre to the north, east, south and west with an additional line to Titanic Quarter. The plan is to build three initially and to have them operating by 2017/18. 
Glasgow, Clyde Fastlink, along the north bank of the River Clyde, with segregated running for the majority of its length outside the city centre. It has been approved by Scottish ministers and is expected to be ready for the 2014 Commonwealth Games.
Leeds, following refusal of funding the proposed Leeds Supertram, a replacement system has been proposed by the government and awaits local authority plans, which include a three-line 12 miles (20 km) trolleybus network. 38% would run on guideways or on bus lanes.
Millennium Transit, a segregated busway intended to link the Millennium Dome with Charlton and Greenwich railway stations, part of which was to include a 1 mile (1.3 km) section of electronic guidance. Intended to be operational when the Dome opened, the electronic guidance technology was abandoned following concerns that neither the system nor the driver was in a position to avoid sudden obstacles. The busway remains in use, unguided.
Route M1, Charlton - Millennium Dome
Route M2, Greenwich - Millennium Dome
Greenwich Waterfront Transit, planned for completion by 2011, abandoned in 2008 due to cancellation of Thames Gateway Bridge.
Stoke-on-TrentStreetcar, primarily to link the railway station to the city centre, but would have also linked the rest of the city's six towns and neighbouring Newcastle-under-Lyme and Kidsgrove. Major destinations included both universities, the hospital and both major football stadia.