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A4

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A4
Location Map ( geo)
Cameraicon.png View gallery (187)
From:  London (TQ313815)
To:  Avonmouth (ST516785)
Distance:  129.8 miles (208.9 km)
Meets:  M4, M5, M25, M49
Primary Destinations
Highway Authorities

National Highways • Transport for London • Bath and North East Somerset  • Bristol  • Buckinghamshire  • Reading  • Slough  • West Berkshire  • Wiltshire  • Windsor and Maidenhead  • Wokingham

Traditional Counties

Berkshire • Buckinghamshire • Gloucestershire • Middlesex • Somerset • Wiltshire

Route outline (key)
A4 London - M4 J5
A4 M4 J5 - Chippenham
A4 Chippenham - Bath
A4 Bath
A4 Bath - Bristol
A4 Bristol
A4 Bristol - Avonmouth

This article is about the British A4. You may be looking for the Northern Irish, Manx or Jersey road with this number.

Route

This is the A4 going under the Clifton Suspension Bridge
Main Article: A4 route

The A4 was the main road from the west of England to London before the coming of the M4. Its route from Avonmouth to London passes through the cities of Bristol and Bath, and the towns of Chippenham, Calne, Marlborough, Hungerford, Newbury, Reading, Maidenhead and Slough. It partly follows the route of the Great Western Main Line.


For more detail on the western end of the route, see A4/Avonmouth - Bath and A4/Bath - Chippenham. For more detail at the London end, see A4/Great West Road. Other sections are awaiting expansion as below.

A4 individual sections

Queen Square, Bath

History

Chiswick Flyover in 1959
Main Article: A4 history

Unlike fellow single digit Ax roads, the A4 has fewer changes. This is mostly due to the fact that the M4 follows closely to the route of the A4. Also of the other single digit Ax Roads, it is the only one to be extended since classification.

Notable locations and improvements

Hyde Park Corner

Hyde Park corner from the north
Main Article: Hyde Park Corner

At Hyde Park Corner, the A4 takes the main line and it goes under it. This was built in the early sixies.

Chiswick Roundabout

This is the A4/M4 split at the Chiswick Roundabout
Main Article: Chiswick Roundabout

The Chiswick Roundabout is where the A4 becomes the M4. It is also the meeting point of the North & South Circular roads.

Maidenhead Bridge

Maidenhead Bridge.
Main Article: Maidenhead Bridge

The Maidenhead Bridge is the A4's crossing of the River Thames. It is in the town of the same name.

Newbridge

Newbridge from the River Avon.
Main Article: Newbridge (Bath)

The Newbridge in Bath is one of the oldest bridges in Bath. It was opened in 1736.

Opening Dates

Month Year Section Notes
1925 Brentford Bypass Great West Road. Officially opened by King George V on 30 May 1925.
1928 Colnbrook Bypass Opened on 18 June 1928.
1928 Twyford Bypass Opened on 10 September 1928.
1942 Cromwell Road Extension Warwick Road to North End Road (unclassified when open).
1956 Cromwell Road Extension Chiswick Lane to the Hammersmith Flyover junction.
1959 Cromwell Road Extension Hammersmith Flyover junction to North End Road (parts may have opened earlier).
1959 Newbury Inner Relief Road Stage 1 (east -west) opened on 16 March 1959.
1959 Chiswick Flyover Dual carriageway realignment and new junction. Opened on 30 September 1959.
1961 Hammersmith Flyover Dual carriageway. Opened on 16 November 1961.
1966 Keynsham Bypass Dual carriageway. Opened on 26 July 1966.
1971 Theale Bypass Dual carriageway. Fully opened on 13 December 1971.
1971 Calne Inner Relief Road May have opened in 1972 (see Network changes - 1970s).
1996 Batheaston Bypass Dual carriageway. Opened in May 1996.

Grid References

Links





A4
Sections
Projects
Junctions
Bath Bridge (Bristol) • Bath Road Junction • Bradford Road Roundabout • Brentford Interchange • Bridge Roundabout • Broadmead • Canal Roundabout • Charing Cross (London) • Chequers • Chiswick Roundabout • Cleveland Place • Concord Roundabout • Cumberland Basin • Gillette Corner • Hammersmith Flyover • Harlington Corner • Henlys Roundabout • Hicks Gate Roundabout • Hogarth Roundabout • Holborn Circus • Huntercombe Spur • Kensington Interchange • Kings Roundabout • Langley Roundabout • Lawrence Weston Interchange • London Road Junction (Bath) • Ludgate Circus • Meuthen Park • Monument • Moor Junction • Piccadilly Circus • Portway Roundabout (Bristol) • Queen Square (Bristol) • Robin Hood Roundabout (Newbury) • Rowden Roundabout • Scotch House • St Andrews Gate Roundabout • St Brendans Roundabout • Sutton Seeds Roundabout • Temple Circus • The Globe • The Pheasant • The Thicket Roundabout • Theale Interchange • Three Lamps Interchange • Trafalgar Square • Twerton Fork • Waggoners Roundabout • Webbington Roundabout
Crossings
Roads
Places
Miscellaneous
Related Pictures
View gallery (187)
Slip road up to elevated M4 - Geograph - 741937.jpgM4 J2 2 - Coppermine - 1282.jpgRidgeway. Dec 1 2008 - Coppermine - 20981.jpgHuntercombe Roundabout - Geograph - 1448521.jpg20160411 0905 - Hammersmith Flyover - 51.4911449 0.2259483W.jpg
Other nearby roads
Central London
A Ring • A2 • A3 • A5 • A10 • A11 • A13 • A23 • A40 • A40(M) (Central London) • A41 • A100 • A200 • A201 • A202 • A203 • A215 • A300 • A301 • A302 • A303 (Vauxhall - Wandsworth) • A400 • A401 • A402 • A404 • A500 (Marble Arch - Finchley) • A501 • A1200 • A1202 • A1203 • A1204 (Wapping) • A1208 • A1209 • A1210 • A1211 • A1212 • A1213 • A2198 • A2200 • A2205 • A2206 • A2207 • A3036 • A3200 • A3201 • A3202 • A3203 • A3204 • A3205 • A3211 • A3212 • A3213 • A3213 (Pall Mall) • A3214 • A3215 • A3217 • A4200 • A4201 • A4202 • A4203 • A4205 • A4208 • A4209 • A4801 • A5200 • A5201 • A5202 • A5203 • A5204 • B100 • B101 • B107 • B126 • B128 • B129 • B130 • B131 • B132 • B133 • B134 • B139 • B144 • B200 • B201 • B202 • B240 • B300 • B308 • B309 • B310 • B310 (Thames Embankment) • B311 (Westminster) • B312 • B323 • B324 • B326 • B327 • B400 • B401 • B402 • B403 • B404 • B405 (Trafalgar Square) • B406 • B500 • B501 • B502 • B503 • B504 • B505 • B506 • B507 • B513 • B521 • B522 • B523 • B524 • CS1 • CS2 • CS3 • CS5 • CS6 • CS7 • CS8 • E1 (Old System) • E2 (Old System) • E5 (Old System) • Ermine Street • EuroVelo 2 • Great North Road • Holyhead Road • London Inner Ring Road • Longest Lane • M1 • M11 • NCN13 • NCN4 • RM3 • Watling Street
Reading
NCN23 • A32 • A33 • A42 (Reading - Birmingham) • A327 • A329 • A329(M) • A3031 (Reading) • A3045 (Berkshire) • A3290 • A4009 • A4074 • A4155 • B478 • B479 • B481 • B3031 • B3031 (Central Reading) • B3032 (Reading) • B3270 • B3345 • B3349 • B3350 • B3350 (Shinfield) • B4007 (Reading) • B4446 • B4526 • C100 (Reading) • C101 (Reading) • C102 (Reading) • C103 (Reading) • C104 (Reading) • C105 (Reading) • C106 (Reading) • C107 (Reading) • C200 (Reading) • C201 (Reading) • C202 (Reading) • C203 (Reading) • C204 (Reading) • C205 (Reading) • C206 (Reading) • C300 (Reading) • C301 (Reading) • C302 (Reading) • C303 (Reading) • C304 (Reading) • C400 (Reading) • C401 (Reading) • C402 (Reading) • C403 (Reading) • C404 (Reading) • C405 (Reading) • C406 (Reading) • C407 (Reading) • C408 (Reading) • C409 (Reading) • C410 (Reading) • C411 (Reading) • C500 (Reading) • C501 (Reading) • C502 (Reading) • C503 (Reading) • C504 (Reading) • C6601 (West Berkshire) • C6709 (West Berkshire) • C6710 (West Berkshire) • C6711 (West Berkshire) • C6712 (West Berkshire) • C6713 (West Berkshire) • E30 • E105 (London - Fishguard) • EuroVelo 2 • Hatfield - Reading Turnpike • Longest Lane • M4 • M31 • NCN4 • POLO • T9 (Britain)
Newbury
Bath
A36 • A39 • A46 • A363 • A367 • A368 • A431 • A3039 • A3062 • A3080 • A3604 • A4016 (Bath) • B3105 • B3108 • B3110 • B3111 • B3118 • B4043 (Bath) • B4044 (Bath) • C1 (Bath and NE Somerset) • C2 (Bath and NE Somerset) • C3 (Bath and NE Somerset) • C4 (Bath and NE Somerset) • C5 (Bath and NE Somerset) • C6 (Bath and NE Somerset) • C7 (Bath and NE Somerset) • C8 (Bath and NE Somerset) • C9 (Bath and NE Somerset) • C10 (Bath and NE Somerset) • C11 (Bath and NE Somerset) • C13 (Bath and NE Somerset) • C14 (Bath and NE Somerset) • C15 (Bath and NE Somerset) • C16 (Bath and NE Somerset) • C17 (Bath and NE Somerset) • C18 (Bath and NE Somerset) • C19 (Bath and NE Somerset) • C20 (Bath and NE Somerset) • C21 (Bath and NE Somerset) • C22 (Bath and NE Somerset) • C23 (Bath and NE Somerset) • C24 (Bath and NE Somerset) • C80 (Bath and NE Somerset) • C305 (Bath and NE Somerset) • C460 (Bath and NE Somerset) • C467 (Bath and NE Somerset) • C472 (Bath and NE Somerset) • C476 (Bath and NE Somerset) • C481 (Bath and NE Somerset) • C492 (Bath and NE Somerset) • C498 (Bath and NE Somerset) • C593 (Bath and NE Somerset) • EuroVelo 2 • Fosse Way • Kelston Toll Road • NCN4 • T9 (Britain) • T39 (Britain) • T44 (Britain)
Bristol
A36 • A37 • A38 • A369 • A370 • A403 • A407 (Bristol) • A420 • A430 (Chippenham - Bristol) • A431 • A432 • A3024 (Bristol) • A3029 • A3034 (Bristol) • A4017 • A4018 • A4032 • A4044 • A4162 • A4174 • A4175 • A4176 • A4320 • B3119 • B3120 • B3121 (Bristol) • B3122 • B3123 (Bristol) • B3124 • B3125 • B3126 • B3129 • B4045 (Keynsham) • B4046 • B4047 (Gloucestershire) • B4048 • B4049 • B4050 • B4051 • B4052 • B4053 • B4053 (Colston Street, Bristol) • B4054 • B4055 • B4056 • B4057 • B4058 • B4465 • B4466 • B4467 • B4468 • B4469 • E30 • E105 (London - Fishguard) • E116 (Old System) • EuroVelo 1 • EuroVelo 2 • Longest Lane • M4 • M5 • M32 • M49 • NCN4 • NCN41 • Outer Circuit Road • South Bristol Spur • T9 (Britain) • T16 (Britain)
A1-A99
The First 99           A1  •  A2  •  A3  •  A4  •  A5  •  A6  •  A7  •  A8  •  A9  • A10 • A11 • A12 • A13 • A14 • A15 • A16 • A17 • A18 • A19
A20 • A21 • A22 • A23 • A24 • A25 • A26 • A27 • A28 • A29 • A30 • A31 • A32 • A33 • A34 • A35 • A36 • A37 • A38 • A39
A40 • A41 • A42 • A43 • A44 • A45 • A46 • A47 • A48 • A49 • A50 • A51 • A52 • A53 • A54 • A55 • A56 • A57 • A58 • A59
A60 • A61 • A62 • A63 • A64 • A65 • A66 • A67 • A68 • A69 • A70 • A71 • A72 • A73 • A74 • A75 • A76 • A77 • A78 • A79
A80 • A81 • A82 • A83 • A84 • A85 • A86 • A87 • A88 • A89 • A90 • A91 • A92 • A93 • A94 • A95 • A96 • A97 • A98 • A99
Motorway sectionsA1(M): (South Mimms - Baldock • Alconbury - Peterborough • Doncaster Bypass • Darrington - Birtley)
A3(M) • A8(M) Baillieston spur • A38(M) • A48(M) Cardiff spur • A57(M) • A58(M) • A64(M) • A66(M) • A74(M) • A92(M)
DefunctA1(M) Newcastle CME • A2(M) Medway Towns Bypass • A4(M) • A5(M) • A8(M) Renfrew bypass • A14 • A14(M) • A18(M) • A20(M) • A36(M)
A40(M): (Westway • Denham -Stokenchurch) • A41(M) • A42 • A46(M) • A48(M): (Port Talbot bypass • Morriston bypass) • A62(M) • A88 • A99
UnbuiltA2(M) Rochester Way Relief Road • A6(M): (Western route • Eastern route) • A14(M) (Expressway) • A34(M) • A48(M) Llantrisant Radial • A59(M) • A61(M)

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