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A40/Carmarthen - Haverfordwest

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< A40
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From:  Carmarthen (SN411191)
To:  Haverfordwest (SM961159)
Meets:  A48, A484, A4242, B4312, B4298, B4299, A4066, A477, B4328, A478, B4313, B4314, A4075, A4076, A487
Old route now:  B4212, B4299, A4066, B4328
Highway Authorities

South Wales Trunk Road Agent


Carmarthenshire • Pembrokeshire

Route outline (key)
Arrownorth.jpg North Haverfordwest - Fishguard
A40 Carmarthern - Haverfordwest
East Arroweast.jpg Brecon - Carmarthen

The section of the A40 to the west of Carmarthen was dualled in the 1980s. Most of the upgrade was on line, but a new alignment was built around Bancyfelin, eliminating a very nasty S-bend under the railway bridge. The A40 dual carriageway continues as far as St Clears, where it splits, the A477 going left for Pembroke (this is the original line of the A40), and the present A40 going right for Whitland, Narberth (where the original route of the A40, now the B4314 rejoins) and Haverfordwest. At St Clears the new bypass eliminated yet another bottleneck of a narrow bridge.

From here to Haverfordwest, the road has been improved, with many examples of new alignments – the biggest of which is the Whitland bypass, which is still only single carriageway, though. On the way, we pass Canaston Bridge, where we cross the eastern branch of the River Cleddau. Downstream, the river provides deep tidal water, which, at Milford Haven, has been exploited by the oil companies in search of sites to build refineries. They are a blot on the landscape but they bring much needed employment to this part of South Wales.

At Haverfordwest the obvious straight ahead route is actually the A487 to St Davids. The A40 makes an abrupt turn northwards to carry the main traffic flow, which is to Fishguard for the ferry to Rosslare. A look at a map of Haverfordwest will show you the old alignments of the A40. Before the northeastern bypass was built, the road ran along the Fishguard Road, some of which is itself a newer alignment. Current Ordnance Survey maps still label Fishguard Road as A40, which suggests that Fishguard Road is now a spur of the A40.

Abbey 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 • Cutteslowe 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 Temporary Terminal • Holtspur Roundabout • Knaves Beech Interchange • Lancaster Gate Gyratory • Llanboidy Road Roundabout • Llandeilo Roundabout • London End Roundabout • Marble Arch • Marston Interchange • Marylebone Flyover • Old Beaconsfield Roundabout • Over Ross Roundabout • Over Roundabout • Oxford Circus • Paddington Interchange • Pedestal Roundabout • Penblewin roundabout • Pensarn Roundabout • Perivale • Polish War Memorial • Pont Lesneven roundabout • 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 • St Clears Roundabout • Stokenchurch Interchange • Sturt Farm Interchange • Swakeleys Roundabout • Tarell roundabout • Target Roundabout • Three Pigeons • Travellers Rest (Carmarthen) • Weston Cross • Westway Roundabout • Wheatley Interchange • Wilton Roundabout (Ross) • Windyhall roundabout • Withybush roundabout • Wolvercote Roundabout • Wood Lane
Related Pictures
View gallery (330)
A40, Lewknor - Coppermine - 20431.jpgThe A40 at Pencraig - Geograph - 1210320.jpgImg 340.jpgCutteslow Roundabout grade separation.pngOld Bath Road bridge over the River Chelt during the July 2007 floods - Geograph - 1122932.jpg
Other nearby roads
St Clears

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