Back ڕێگەی ئەی ٤٠ CKB Ffordd yr A40 Welsh A40 road German A40 (Groot-Brittannië) Dutch A40公路 (英國) Chinese
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 Holborn Viaduct carries the A40 | ||||
| Route information | ||||
Part of  E30 | ||||
| Maintained by National Highways, English local authorities, South Wales Trunk Road Agent and North & Mid Wales Trunk Road Agent | ||||
| Length | 261.2 mi[1][2][3] (420.4 km) | |||
| Major junctions | ||||
| East end |   A1 / A1121 in City of London | |||
see also: A40 road (London)
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| West end | Goodwick (Fishguard) | |||
| Location | ||||
| Country | United Kingdom | |||
| Counties | England: Greater London, Buckinghamshire, Oxfordshire, Gloucestershire, Herefordshire Wales: Monmouthshire, Powys, Carmarthenshire, Pembrokeshire | |||
| Primary destinations | London, Beaconsfield, High Wycombe, Oxford, Cheltenham, Gloucester, Ross-on-Wye, Monmouth, Abergavenny, Brecon, Llandovery, Llandeilo, Carmarthen, Haverfordwest, Fishguard | |||
| Road network | ||||
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The A40 is a trunk road which runs between London and Goodwick (Fishguard), Wales, and officially called The London to Fishguard Trunk Road (A40) in all legal documents and Acts. Much of its length within England has been superseded by motorways, such as the M40, and has lost its trunk road status, though it retains it west of Gloucester, including its length within Wales. It is approximately 260 miles (420 km) long. The eastern section from Denham, Buckinghamshire to Wheatley, Oxfordshire is better served by the M40 and its former function of linking London with Cheltenham and Gloucester has been taken by the M4, A419 and A417 via Swindon.