A23 (London)

A23 (London)
Country	England
Route	23
Length mi	33
Direction	A=North
Terminus A	City of Westminster
Direction B	South
Terminus B	Brighton
Regions	Greater London, West Sussex, East Sussex

A23 (London) The A23 is a major arterial route connecting central London with southern suburbs and the wider Sussex coast, running from the City of Westminster through Croydon and Purley toward Caterham and Coulsdon before continuing to Brighton and Hove. It serves as a strategic link between Central London transport hubs, suburban commercial centres, and seaside resorts, intersecting with national routes and rail corridors such as London Victoria station, London Bridge station, East Croydon station, and the Brighton Main Line. The road underpins access to civic institutions, retail districts, and green spaces including Hyde Park, Clapham Common, and the South Downs National Park.

Route

The A23 begins near Oxford Street and the West End in the City of Westminster, proceeding south through Chelsea, Battersea, and Clapham before crossing the River Wandle corridor and entering Lambeth and Wandsworth. It continues past Streatham and Tooting into the London Borough of Merton, skirting Mitcham and reaching the suburban hubs of South Croydon and Purley in the London Borough of Croydon. South of the capital it traverses the North Downs escarpment near Coulsdon and Caterham, meeting the M25 motorway orbital at junctions close to Hooley and Chipstead. Beyond Greater London the A23 passes through Bolney, Handcross, Poulshot, and Haywards Heath before entering Brighton where it terminates near Brighton Marina and links with the A27 road coastal corridor.

History

The A23 follows ancient trackways and turnpike routes established in the 18th and 19th centuries linking London Bridge approaches to the Port of Shoreham and Brighton as a seaside resort popularised by George IV and Richard Russell (physician). Improvements in the Victorian era coincided with railway expansion by companies like the London, Brighton and South Coast Railway and later national operators including British Railways. Twentieth-century upgrades responded to motor traffic growth, with interwar schemes and postwar road planning influenced by the Road Traffic Act 1930 and the debates surrounding the Greater London Plan. Motorway-era developments, notably the M23 motorway project proposals and the completion of the M25 motorway, affected A23 routing and capacity, while local initiatives by boroughs such as Croydon London Borough Council and Lambeth London Borough Council shaped urban sections.

Junctions and key destinations

Major junctions include intersections with the A3 road near Clapham Common, the A205 (South Circular) at Streatham, the A232 road in Croydon, and the A264 and A22 road in outer suburbs. The A23 provides access to cultural and civic destinations such as Tate Britain, Royal Albert Hall, Croydon Clocktower, Boxpark Croydon, Crystal Palace, and healthcare centres including St George's Hospital and Croydon University Hospital. It serves sporting and leisure venues like Selhurst Park, Falmer Stadium (Amex Stadium) via connecting routes, and retail centres including Westfield London through feeder roads and Purley Way retail parks. Strategic transport interchanges on the corridor include London Victoria station, Clapham Junction railway station, East Croydon station, and Gatwick Airport access roads.

Public transport and cycling

The A23 corridor is paralleled by rail services on the Brighton Main Line operated by franchisees and overseen historically by Network Rail, providing high-frequency commuter links to London Victoria and London Bridge. Bus services operated by Transport for London routes and private operators link central London termini with suburban destinations, integrating with Oyster card and Contactless payment systems. Cycle infrastructure includes sections of the London Cycle Network and quieter routes promoted by Sustrans and campaigning groups such as London Cycling Campaign and Cycling UK, with dedicated lanes and Quietways in parts of Lambeth and Wandsworth.

Road management and maintenance

Responsibility for the A23 is split among national and local authorities: trunk sections historically managed by National Highways (formerly Highways England) outside Greater London, and urban sections administered by London boroughs including Westminster City Council, Wandsworth Borough Council, Lambeth Council, and Croydon Council. Funding and planning interact with bodies such as the Department for Transport and the Mayor of London office, while maintenance contractors include regional firms appointed via competitive tendering from frameworks involving Skanska, Balfour Beatty, and specialist resurfacing suppliers. Asset management covers carriageway resurfacing, bridge inspections for structures over the River Wandle and railway lines, drainage upgrades, and street lighting coordinated with utilities like Thames Water and UK Power Networks.

Traffic and safety

The A23 experiences peak congestion on approaches to central London and at suburban nodes like Streatham High Road and Croydon Flyover, with collision hotspots identified near junctions with the A232 and A22. Safety initiatives have involved partnerships between Metropolitan Police Service road policing units, local council road safety teams, and casualty reduction programs promoted by Road Safety Foundation and Brake (charity). Traffic management measures include signal optimisation, speed limit reviews under the Road Traffic Regulation Act 1984, pedestrian crossings near schools associated with Great Ormond Street Hospital outreach, and low-emission zones influenced by Mayor of London air quality strategies.

Future developments and proposals

Proposals affecting the corridor include upgrades to junctions tied to Gatwick Airport Expansion debates, strategic planning in local plans by Brighton and Hove City Council, Mid Sussex District Council, and Reigate and Banstead Borough Council, and transport policy initiatives under the Mayor's Transport Strategy. Active campaigns consider bus priority schemes, cycle superhighway extensions championed by Friends of the Earth and Sustrans, and junction remodelling funded via the Local Growth Fund and national levelling-up discussions. Climate resilience projects and smart corridor pilots involving TfL and technology partners like Siemens aim to reduce emissions and improve journey-time reliability.

Category:Roads in London Category:Roads in Sussex