A40/Carmarthen - Haverfordwest
|Meets:||A48, A484, A4242, B4312, B4298, B4299, A4066, A477, B4328, A478, B4313, B4314, A4075, A4076, A487|
|Old route now:||B4212, B4299, A4066, B4328|
South Wales Trunk Road Agent
Carmarthenshire • Pembrokeshire
|Route outline (key)|
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.