A4

A4
View gallery (178)
From:	London (TQ313815)
To:	Avonmouth (ST516785)
Length:	129.8 miles (208.9 km)
Meets:	M4, M5, M25, M49
Primary Destinations
Heathrow Airport
Highway Authorities
Highways England • Transport for London • Bath and North East Somerset Council • Bristol Council • Buckinghamshire Council • Reading Council • Slough Council • West Berkshire Council • Wiltshire Council • Windsor and Maidenhead Council • Wokingham Council
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

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

• A4/Avonmouth - Bath
• A4/Bath - Chippenham
• A4/Chippenham - Marlborough (awaiting expansion)
• A4/Marlborough - Newbury (awaiting expansion)
• A4/Newbury - Reading (awaiting expansion)
• A4/Reading - Slough (awaiting expansion)
• A4/Slough - London (awaiting expansion)
• A4/Great West Road

History

Chisiwick Flyover in 1959

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

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

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

Maidenhead Bridge

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.

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

Opening Dates

Grid References

• Holborn Circus, London: TQ313815
• Avonmouth: ST516785

Links

Article Rating

A4

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 • Hyde Park Corner • 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 Gyratory • The Globe • The Pheasant • The Thicket Roundabout • Theale Interchange • Three Lamps Interchange • Trafalgar Square • Twerton Fork • Waggoners Roundabout • Webbington Roundabout

Crossings Batheaston Bypass Bridge • Chippenham Bypass Bridge • Hungerford Bridge • Maidenhead Bridge • New Bath Road Bridge • Newbridge (Bath) • Pan Bridge • Peel Street Bridge

Roads E1 (Old System) • E105 (London - Fishguard) • EuroVelo 1 • EuroVelo 2 • Fosse Way • Longest Lane • NCN4 • T13 (Britain) • T8 (Britain) • T9 (Britain)

Miscellaneous A4/Named Junctions • A4/history • A4/route • Bath Tunnel

Related Pictures View gallery (178)

Other nearby roads Central London A Ring • A1/Central London - South Mimms • A10 • A100 • A11 • A1200 • A1202 • A1203 • A1204 (Wapping) • A1208 • A1209 • A1210 • A1211 • A1212 • A1213 • A13 • A2 • A200 • A201 • A202 • A203 • A215 • A2198 • A2200 • A2205 • A2206 • A2207 • A23 • A3 • A300 • A301 • A302 • A303 (Vauxhall - Wandsworth) • A3036 • A3200 • A3201 • A3202 • A3203 • A3204 • A3205 • A3211 • A3212 • A3213 • A3213 (Pall Mall) • A3214 • A3215 • A3217 • A4/Great West Road • A40 • A40(M) (Central London) • A40/Central London - Denham • A400 • A401 • A402 • A404 • A41 • A41/Central London - Watford • A4200 • A4201 • A4202 • A4203 • A4205 • A4208 • A4209 • A4801 • A5 • A5/Central London - Brockley • A500 (Marble Arch - Finchley) • A501 • 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 A3031 (Reading) • A3045 (Berkshire) • A32 • A327 • A329 • A329(M) • A3290 • A33 • A4/Newbury - Reading • A4/Reading - Slough • A4009 • A4074 • A4155 • A42 (Reading - Birmingham) • B3031 • B3031 (Central Reading) • B3032 (Reading) • B3270 • B3345 • B3349 • B3350 • B3350 (Shinfield) • B4007 (Reading) • B4446 • B4526 • B478 • B479 • B481 • 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) • E105 (London - Fishguard) • E30 • EuroVelo 2 • Hatfield - Reading Turnpike • Longest Lane • M31 • M4 • NCN23 • NCN4 • POLO • T9 (Britain) Newbury A339 • A34 • A343 • A4/Marlborough - Newbury • A4/Newbury - Reading • B3052 (Newbury) • B3421 • B4000 • B4009 • B4494 • B4640 • E05 • E105 (London - Fishguard) • E30 • Ermin Street • EuroVelo 2 • NCN4 • T13 (Britain) • T38 (Britain) • T9 (Britain) Bath A3039 • A3062 • A3080 • A36 • A3604 • A363 • A367 • A368 • A39 • A39/Bath - Wells • A4/Avonmouth - Bath • A4/Bath - Chippenham • A4016 • A431 • A46 • B3105 • B3108 • B3110 • B3111 • B3118 • B4043 (Bath) • B4044 (Bath) • EuroVelo 2 • Fosse Way • Kelston Toll Road • NCN4 • T39 (Britain) • T44 (Britain) • T9 (Britain) Bristol A3024 (Bristol) • A3029 • A3034 (Bristol) • A36 • A369 • A37 • A370 • A38 • A38/Highbridge - Bristol • A38/Through Bristol • A4/Avonmouth - Bath • A4017 • A4018 • A403 • A4032 • A4044 • A407 (Bristol) • A4162 • A4174 • A4175 • A4176 • A420 • A430 (Chippenham - Bristol) • A431 • A432 • 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 • E105 (London - Fishguard) • E116 (Old System) • E30 • EuroVelo 1 • EuroVelo 2 • Longest Lane • M32 • M4 • M49 • M5 • NCN4 • Outer Circuit Road • South Bristol Spur • T16 (Britain) • T9 (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 sections A1(M): (South Mimms - Baldock • Alconbury - Peterborough • Doncaster Bypass • Darrington - Leeming • Barton - Birtley) A3(M) • A8(M) Baillieston spur • A14(M) • A38(M) • A48(M) Cardiff spur • A57(M) • A58(M) • A64(M) • A66(M) • A74(M) • A92(M) Defunct A1(M) Newcastle CME • A2(M) Medway Towns Bypass • A4(M) • A5(M) • A8(M) Renfrew bypass • A14 • 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 Unbuilt A2(M) Rochester Way Relief Road • A6(M): (Western route • Eastern route) • A34(M) • A48(M) Llantrisant Radial • A59(M) • A61(M)