|From:||Broomhill Burrows (SM883010)|
|Via:||Castlemartin, Merrion, St Petrox|
|Distance:||10.4 miles (16.7 km)|
|Route outline (key)|
The B4319 is a U-shaped road in Pembrokeshire's Castlemartin Peninsula. The road was originally unclassified but gained its number in 1935.
The road starts on the S1 B4320 and heads south, itself S1, past the war memorial before descending into the dunes. There is an excellent view of the coastline as far as St Govan's Head. After passing a car park the sea becomes hidden by the dunes, then we detour slightly inland before returning to the coast; the road seems exceptionally narrow in places as the sand has spread over the road. After passing a car park at Freshwater West the road climbs and the sea becomes visible again, then we turn inland.
We continue east across dunes and moor before reaching Castlemartin, historically at least the chief settlement of this part of the country. The old village pound, now a garden, is on a roundabout. Here the road turns right but this immediately enters the Castlemartin Range and so the road is periodically closed to traffic so firing can take place. There is no alternative signposted route but when the road is closed traffic presumably takes the next road anticlockwise then bears right through Warren into Merrion, rejoining the B4319 at a T-junction. The actual B4319 heads south from Castlemartin, then bears left and becomes S2 as it crosses the fields and military tracks. There's a frequently closed road to the right to Elegug Stacks after which we return to the "bypass"; signs here are displayed when the road west is closed directing traffic via Merrion.
The road continues alongside the military area along a wide, straight road which presumably owes its engineering to the army although the road has always existed on this alignment. Presently there's a sharp left-hand bend; the road to the right serves Bosherston and St Govan's Head, where there is a car park and a back way onto the firing range. The B4319 continues to bend left and is soon heading NNW before zigzagging, with very sharp bends, through St Petrox. The road narrows for a short distance past the church and campsite.
We continue vaguely northwards and cross a steep valley before we come to a T Junction at Kingsfold where we have to TOTSO right. We then go under power lines linking Pembroke Power Station with the rest of the grid before descending into Pembroke. There's an escape lane here although the road is no steeper than other sections of the B4319. Just afterwards the road ends at a T-junction on the A4139. The town centre and Pembroke Dock are to the left but the rest of the country is to the right.