A3 (Great Britain)

A3 (Great Britain)
Country	GBR
Length mi	95
Terminus a	Southampton
Terminus b	London
Maintained by	Highways England

A3 (Great Britain) The A3 is a principal trunk road linking Southampton and Central London via Portsmouth and Guildford. It forms a strategic corridor connecting Hampshire, Surrey, and Greater London with arterial links to M27 motorway, M25 motorway, and A316 road. The route serves commuter, commercial, and leisure traffic, interfacing with ports, rail termini, and suburban centres such as Waterloo Station, Guildford Cathedral, and Portsmouth Harbour.

Route description

The A3 begins at the west in Southampton near the confluence with the A33 road and proceeds eastward through Romsey, skirting urban edges toward Portsmouth. It traverses the South Downs National Park with a high-quality section passing near Queen Elizabeth Country Park and Buriton. Continuing northeast, the A3 meets Petersfield before advancing through Guildford where it intersects the A31 road and connects with Guildford railway station and Guildford Cathedral. North of Guildford, the A3 climbs through Hogs Back and joins the A24 road approaches toward Cobham and Esher. The route then skirts Richmond Park and proceeds into Kingston upon Thames crossing the River Thames on the Kingston Bridge, intersecting A2043 road and A308 road links. Entering Greater London, the A3 follows the Clapham Common corridor toward Wandsworth, where it meets South Circular Road alignments, and terminates in central London near Waterloo and the approaches to Westminster Bridge and South Bank.

History

The A3 has origins in pre‑motorway turnpikes that connected Portsmouth to London during the 18th century, with documented use by figures travelling between Pall Mall and naval facilities at Portsmouth Dockyard. 19th-century improvements paralleled railway expansions such as South Western Railway and stations like Portsmouth Harbour railway station. Interwar road modernisation under the Ministry of Transport (United Kingdom) reclassified and upgraded stretches, and post‑World War II schemes tied A3 improvements to initiatives by Transport Minister Ernest Marples and proposals influenced by the Greater London Plan. Civic disputes in the late 20th century involved bodies including Guildford Borough Council and Surrey County Council over bypasses and conservation near Box Hill. The construction of the Esher bypass and the Kingston approaches were shaped by debates featuring Campaign for the Protection of Rural England and local MPs such as Sir George Young.

Road improvements and upgrades

Major upgrades include the 1970s dual carriageway schemes bypassing Hindhead and the later construction of the single‑bore Hindhead Tunnel, delivered by contractors under oversight of Highways England successors and opened after approvals influenced by environmental assessments involving Natural England. Junction reconstructions have linked the A3 to the M27 motorway and the M25 motorway orbital, enabling freight movements to ports like Portsmouth International Port and Southampton Port. Urban sections in Kingston upon Thames and Wandsworth underwent resurfacing and capacity changes coordinated with Transport for London projects, while safety fences and lighting upgrades near Richmond Park were implemented following recommendations from National Highways and local wardens. Proposals for smart motorways and managed motorway schemes have been periodically considered in consultation with Department for Transport (United Kingdom) and regional authorities.

Traffic and safety

Traffic volumes on the A3 vary from heavy urban commuter flows near Waterloo and Kingston upon Thames to mixed freight and tourist flows toward Portsmouth and Southampton. Peak congestion is frequent at interchanges with the M25 motorway and at approaches to Guildford and Kingston Bridge, often discussed in congestion reports by Transport for London and Surrey County Council. Collision clusters have been recorded near complex junctions such as the Esher interchange and the Hindhead descent; responses have involved local policing by Metropolitan Police Service and Hampshire Constabulary and engineering measures influenced by guidelines from Roads Liaison Group. Air quality and noise considerations prompted mitigation schemes adjacent to Richmond Park and residential zones near Wandsworth Common with monitoring linked to Public Health England assessments.

Notable junctions and settlements

Key urban nodes along the A3 include Southampton, Portsmouth, Fareham, Petersfield, Guildford, Woking, Cobham, Esher, Kingston upon Thames, Surbiton, Wandsworth, and Waterloo. Major junctions and interchanges connect to the M27 motorway at Fareham, the A27 road near Portsmouth, the A31 road at Guildford, and the M25 motorway at junctions providing radial access to Heathrow Airport and orbital traffic. The Hindhead Tunnel portal is adjacent to Grayshott and replaced the former Hindhead Gap road; Kingston Bridge provides a critical Thames crossing linked to A2043 road and A308 road networks. Nearby rail hubs include Southampton Central railway station, Portsmouth Harbour railway station, Guildford railway station, Woking railway station, and London Waterloo railway station.

Public transport and cycling infrastructure

The A3 corridor is paralleled by rail services on South Western Railway and commuter routes serving Portsmouth Harbour to London Waterloo, integrating intermodal journeys at stations such as Woking and Guildford. Bus corridors managed by Transport for London operate on sections within Greater London and link to long‑distance coach services at Victoria Coach Station and local interchanges in Kingston. Cycling infrastructure improvements have been incorporated in urban schemes near Richmond Park and Kingston upon Thames with segregated lanes influenced by guidance from Sustrans and local cycle forums; however, continuous high‑quality cycle routes along the entire corridor remain a matter of planning between Surrey County Council and Transport for London.

Category:Roads in England