A4 road (England)

A4 road (England). The A4 is a major historic road in England, connecting the capital city of London with the port city of Bristol. For centuries, it served as the principal route between these two important centres, following a course largely superseded by the modern M4 motorway. The road passes through numerous significant towns and landscapes, including Reading, Newbury, Marlborough, and Bath, weaving through the counties of Greater London, Berkshire, Wiltshire, and Somerset.

Route

Beginning at a complex junction with the A1 road and other routes in the London Borough of Hounslow, the A4 heads west through the suburbs of Chiswick and Brentford. It crosses the River Thames at Chiswick Bridge before passing near the grounds of Kew Gardens and Syon Park. Beyond Hounslow, the road traverses the western fringes of London Heathrow Airport and continues into the Thames Valley. It serves as a primary thoroughfare for Slough and Maidenhead before reaching the major urban centre of Reading. From Reading, the route proceeds through the market towns of Newbury and Hungerford, skirting the northern edge of the North Wessex Downs Area of Outstanding Natural Beauty. It passes through the historic town of Marlborough near the prehistoric site of Silbury Hill and the West Kennet Long Barrow. The road then descends into the Avon Valley, serving the World Heritage city of Bath before its final approach into Bristol, terminating at a junction with the A38 road near the city centre.

History

The western sections of the A4's alignment follow the course of the ancient Roman roads in Britain, specifically the route between Calleva Atrebatum (near Silchester) and Aquae Sulis (Bath). From the 17th century onwards, it was developed as a key turnpike trust route, famously known as the Great West Road between London and Bristol. This period saw significant improvements under acts of Parliament, facilitating faster mail and passenger coach services operated by companies like the Bristol Mail. The road played a crucial role during the English Civil War, with armies marching along its length, and was later traversed by figures such as Samuel Johnson and James Boswell. The advent of the Great Western Railway, engineered by Isambard Kingdom Brunel, paralleled much of its route in the 19th century. The 20th century brought further transformation with the construction of the M4 motorway, which opened in stages from the 1960s to the 1970s, ultimately relegating the A4 to a more local and secondary strategic function.

Major junctions

From east to west, key intersections include its start at the Hogarth Roundabout in London, meeting the A316 road and the M4 motorway. It crosses the A412 road at Heathrow Airport and meets the A404 road near Maidenhead. In Reading, it intersects with the A33 road and the A329 road. Critical junctions occur at Newbury with the A34 road, at Marlborough with the A346 road, and in Bath with the A36 road and the A46 road. Its western terminus in Bristol is a major junction with the A38 road and the A4032 road, providing access to the city's Port of Bristol and the Clifton Suspension Bridge.

Cultural references

The A4 has been immortalised in literature and music, notably in John Betjeman's poetry celebrating the suburban landscapes of Metro-land. It features in the title of the Kinks song "The Road", which references the older trunk routes. The historic Great West Road section inspired the name of the Great West Road recording studios. The road's path through the West Country is evoked in various travel writings and historical accounts of the Bristol Channel trade. Its former importance as a coaching route is depicted in numerous works about the Georgian era, including references to the notorious highwayman Dick Turpin.

Future

Current plans focus on the A4's role within local transport networks rather than long-distance travel. Several Bus lane and cycling improvement schemes are underway in sections through Reading and Bath, aligned with the policies of West of England Combined Authority. There are ongoing discussions about further traffic calming measures in historic towns like Marlborough and Corsham. The route is also part of studies for enhancing resilience of the road network parallel to the M4 motorway, particularly concerning diversion routes during incidents on the motorway. No major highway expansion is planned, with investment prioritising sustainable transport and maintaining its function as a vital local artery and historical corridor.

Category:A roads in England Category:Transport in London Category:Transport in Bristol