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A40

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A40
Cameraicon.png View gallery (324)
From:London (TQ321815)
To:Fishguard (SM946381)
Via:Uxbridge, Beaconsfield, High Wycombe, Oxford, Gloucester, Abergavenny, Carmarthen
Length:263 miles (423.2 km)
Meets: M5, M40, A1, A4, A5, A38, A44, A48, A46, A48, A49, A312, A329, A355, A361, A404, A406, A412, A413, A415, A417, A418, A420, A429, A435, A436, A437, A449, A465, A466, A470, A477, A478, A479, A482, A483, A484, A485, A487
Former Number(s):A40(M), A48
Highway Authorities

Highways England • North and Mid Wales Trunk Road Agent • South Wales Trunk Road Agent • Transport for London • Buckinghamshire Council • City of London • Gloucestershire Council • Herefordshire Council • Islington Council • Oxfordshire Council • Westminster Council

Traditional Counties

Brecknockshire • Buckinghamshire • Carmarthenshire • Gloucestershire • Herefordshire • Middlesex • Monmouthshire • Oxfordshire • Pembrokeshire

Route outline (key)
A40 Bank, London - St Paul's
A40 St Paul's - Marble Arch
(A5) Marble Arch - Edgware Road
A40 Edgware Road - M40
A40 M40 - Oxford
A40 Oxford - Fishguard

Contents

Route

The Westway in 2007

The A40 is a major road that runs between London and Fishguard. Going via Oxford and Gloucester it is a road of varying degrees of standard from ex motorway to S2. At a distance of 263 miles it makes the A40 Britain's 7th longest road.

See Route Sections: Central London - DenhamDenham - WheatleyWheatley - WitneyWitney - CheltenhamCheltenham - RossRoss - AbergavennyAbergavenny - BreconBrecon - CarmarthenCarmarthen - HaverfordwestHaverfordwest - Fishguard

History

High Holburn in 1965
Main Article: A40/History

As with many of the long A-roads, the A40 has had a vast array of upgrades over the years. Some major, others not so major. However the section from Denham to Oxford Services was mostly replaced by the M40 therefore this section has had very few changes.

Notable locations and improvements

Holborn Viaduct

Holburn Viaduct from A201 level
Main Article: Holborn Viaduct

Holborn Viaduct is the city of London's only bridge wholly within the square mile. Built in 1869, it allows the A40 to cross the A201. The lost River Fleet is underneath the A201.

Denham Roundabout

One of the roundabouts of the Denham Roundabout
Main Article: Denham Roundabout

The Denham Roundabout is where the A40 become M40. It is where the A40 loses it trunk status until Oxford services

Golden Valley Junction

The A40 overbridge seen on the M5.

The Golden Valley junction is where the A40 meets the M5. It is one of the busiest junctions found on the M5 therefore a important one.

Gibraltar Tunnels

Approaching the Monmouth Tunnels.
Main Article: Gibraltar Tunnels

The Gibraltar Tunnels (Welsh:Twneli Gibraltar) are found at Monmouth. Also known as the Monmouth Tunnel it is to the south of Monmouth and was built in the 1960s.

Opening Dates

Month Year Section Notes
2000 Westway Road downgraded from Motorway to A40.
1960s Gibraltar Tunnels Tunnel south of Monmouth.
1869 Holborn Viaduct Bridge over the A201.

Links

Roads UK



A40
JunctionsAbbey Way Gyratory • Abergwili Roundabout • Arle Court Roundabout • Asthall Barrow Roundabout • Bank • Benhall Roundabout • Blackbridge Roundabout • Bridgend Square • Brynich roundabout • Burford Roundabout • Canaston Bridge Roundabout • Coxs Meadow • Cutteslow Roundabout • Denham Roundabout • Ealing Common • Eden Roundabout • Elmbridge Court Roundabout • Eynsham Roundabout • Forest Gate Junction • Gipsy Corner • Golden Valley Junction • Greenford Roundabout • Hanger Lane Gyratory • Hardwick Gyratory • Headington Roundabout • Highnam Corner • Highnam Roundabout • Hildersley Roundabout • Hillingdon Circus • Holborn Circus • Holland Park Roundabout • Holtspur Roundabout • Holtspur Temporary Terminal • Knaves Beech Interchange • Lancaster Gate Gyratory • Llanboidy Road Roundabout • Llandeilo Roundabout • London End Roundabout • Marble Arch • Marylebone Flyover • Old Beaconsfield Roundabout • Over Ross Roundabout • Over Roundabout • Oxford Circus • Paddington Interchange • Pedestal Roundabout • Penblewin roundabout • Pensarn Roundabout • Perivale • Polish War Memorial • Prendergast Roundabout • Pyebush Roundabout • Rafael roundabout • Raglan Interchange • Raglan Roundabout • Robeston Wathen Roundabout • Salutation Square • Savoy Circus • Scotchwell roundabout • Shepherds Bush Green • Square and Compass • St Giles Circus • St Pauls Gyratory • Stokenchurch Interchange • Swakeleys Roundabout • Tarell roundabout • Target Roundabout • Three Pigeons • Weston Cross • Westway Roundabout • Wheatley Interchange • Wilton Roundabout (Ross) • Windyhall roundabout • Withybush roundabout • Wolvercote Roundabout • Wood Lane
ServicesMonmouth services • Oxford services • Ross Spur services • Stokenchurch services • Symonds Yat services
CrossingsA40 Bridge • Bridstow Bridge • Carmarthen Bypass Bridge • Chain Bridge (Llandovery) • Cherwell Bridge • Fishguard - Rosslare ferry • Gibraltar Tunnels • Holborn Viaduct • Marylebone Flyover • Over Bridge • Pont Lesneven • Wheatley Bypass Bridge • Witney Bypass Bridge
RoadsA40(M) (Central London) • A40(M) (Denham - Stokenchurch) • A40/Abergavenny - Brecon • A40/Brecon - Carmarthen • A40/Carmarthen - Haverfordwest • A40/Central London - Denham • A40/Cheltenham - Ross • A40/Denham - Wheatley • A40/Haverfordwest - Fishguard • A40/Ross - Abergavenny • A40/Wheatley - Witney • A40/Witney - Cheltenham • E105 (London - Fishguard) • E30 • EuroVelo 1 • Longest Lane • NCN4 • Oxford Ring Road • T10 (Britain) • T17 (Britain) • T43 (Britain) • T75 (Britain) • T77 (Britain) • T78 (Britain) • T79 (Britain) • Watling Street
MiscellaneousA40/History • A40/Named Junctions • A40/Route
Related Pictures
View gallery (324)
A40 Tunnel, Monmouth - Coppermine - 20495.jpgFootbridge to Abergwili - Coppermine - 21944.jpgGreenford Roundabout - Geograph - 1035085.jpgHolborn - Coppermine - 2763.jpgMonmouth , D2 traffic lights On A40 - Coppermine - 20497.jpg
Other nearby roads
LondonA1 • A1(M) • A10 • A101 • A11 • A11(M) • A127 • A13 • A2 • A2(M) (Kidbrooke - Falconwood) • A20 • A21 • A216 • A23 • A23(M) • A233 • A24 • A3 • A30 • A30/Sandbox • A4 • A4/Great West Road • A4/Slough - London • A40/Central London - Denham • A41 • A41/Central London - Watford • A41/Watford - Aylesbury • A5 • A5/Central London - Brockley • B269 • B519 • E1 (Old System) • E105 (London - Fishguard) • E107 (London - Tilbury) • E108 (London - Southend) • E13 • E15 • E2 (Old System) • E30 • E31 (via Carlisle) • E31 (via Newcastle) • E33 (London - Glasgow) • E5 (Old System) • E8 (Old System) • East Cross Route • Ermine Street • EuroVelo 2 • EuroVelo 5 • Great North Road • Holyhead Road • London Inner Ring Road • Longest Lane • M1 • M100 • M11 • M12 (Brentwood - Chelmsford) • M12 (Woodford - Brentwood) • M12 (Woodford - Maplin) • M13 • M14 • M15 • M16 • M20 • M23 • M25 • M3 • M30 • M4 • M40 • M41 • NCN1 • NCN13 • NCN20 • NCN21 • NCN4 • Northern and Western Motorway • Orbital Tunnel Route • RM3 • Ringway 2 • South Cross Route • T1 (Britain) • T10 (Britain) • T11 (Britain) • T12 (Britain) • T2 (Britain) • T3 (Britain) • T31 (Britain) • T32 (Britain) • T33 (Britain) • T34 (Britain) • T35 (Britain) • T4 (Britain) • T5 (Britain) • T6 (Britain) • T8 (Britain) • T9 (Britain) • Watling Street
OxfordA34 • A40/Wheatley - Witney • A4074 • A4141 (Oxford) • A4142 • A4144 • A4158 • A4165 • A42 (Reading - Birmingham) • A420 • A423 • A4260 • A43 • A44 • B4014 (Oxfordshire) • B4027 • B4150 • B4495 • B4496 • B480 • E05 • Longest Lane • M40 • NCN51 • Oxford Ring Road • T10 (Britain) • T114 (Britain) • T13 (Britain) • T42 (Britain) • T47 (Britain)
BreconA40/Abergavenny - Brecon • A40/Brecon - Carmarthen • A4059 • A4062 (Brecon) • A438 • A470 • B4520 • B4557 (Brecon) • B4558 • B4559 • B4601 • B4602 • NCN8 • T75 (Britain) • T77 (Britain)
CarmarthenA40/Brecon - Carmarthen • A40/Carmarthen - Haverfordwest • A4052 (Carmarthen) • A4116 (Carmarthen) • A4213 • A4242 • A4243 • A475 (Swansea - Carmarthen) • A48 • A484 • A485 • B4207 (Carmarthen) • B4300 • B4301 • B4309 • B4312 • B4424 (Carmarthen) • E105 (London - Fishguard) • E30 • EuroVelo 1 • NCN4 • T10 (Britain) • T79 (Britain)
FishguardA40/Haverfordwest - Fishguard • A4219 • A487 • B4313 • B4330 (Fishguard - St Davids) • B4331 (Fishguard - Mathry) • E105 (London - Fishguard) • E30 • EuroVelo 1 • NCN4 • T10 (Britain) • T81 (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 - 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)
DefunctA1(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
UnbuiltA2(M) Rochester Way Relief Road • A6(M): (Western route • Eastern route) • A34(M) • A48(M) Llantrisant Radial • A59(M) • A61(M)