A40/Carmarthen - Haverfordwest

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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.

Knaves Beech Interchange • Shepherds Bush Green • Golden Valley Junction • Holtspur Temporary Terminal • Marble Arch • Marylebone Flyover • Hanger Lane Gyratory • Denham Roundabout • Three Pigeons • Wheatley Interchange • Stokenchurch Interchange • Holborn Circus • Wolvercote Roundabout • Headington Roundabout • Target Roundabout • Hillingdon Circus • Wood Lane • Westway Roundabout • Holland Park Roundabout • Savoy Circus • Gipsy Corner • Perivale • Pyebush Roundabout • Pedestal Roundabout • Cutteslow Roundabout • Greenford Roundabout • Polish War Memorial • Swakeleys Roundabout • Burford Roundabout • Coxs Meadow • Benhall Roundabout • Over Roundabout • Highnam Roundabout • Wilton Roundabout (Ross) • Arle Court Roundabout • Elmbridge Court Roundabout • Ealing Common • Windyhall roundabout • Rafael roundabout • Withybush roundabout • Penblewin roundabout • Brynich roundabout • Salutation Square • Bank • London End Roundabout • Old Beaconsfield Roundabout • Holtspur Roundabout • Eden Roundabout • Abbey Way Gyratory • Tarell roundabout • Hardwick Gyratory • Paddington Interchange • Over Ross Roundabout • Raglan Interchange • Forest Gate Junction • Highnam Corner • Scotchwell roundabout • Oxford Circus • St Giles Circus • Lancaster Gate Gyratory • St Pauls Gyratory • Blackbridge Roundabout • Llanboidy Road Roundabout • Robeston Wathen Roundabout • Canaston Bridge Roundabout • Bridgend Square • Prendergast Roundabout • Asthall Barrow Roundabout • Eynsham Roundabout • Weston Cross • Hildersley Roundabout • Raglan Roundabout • Square and Compass • Llandeilo Roundabout • Abergwili Roundabout • Pensarn Roundabout • Lesneven Roundabout • Travellers Rest (Carmarthen)
Related Pictures
View gallery (324)
A40 over B4558 - Coppermine - 23087.jpgA40 just before entering wales - Coppermine - 20764.jpgA40 Llansantffraed Junction Improvement - Coppermine - 11630.jpgBridstow Bridge crossing the River Wye - Geograph - 678291.jpgBoxbush - Remains of railway bridge - Geograph - 168289.jpg
Other nearby roads
St Clears