Does anyone have any more details on the closure of this road yesterday?

It is near the Oxwich turn-off and the entrance to Perriswood Archery and is on limestone and oolite. It was reported as being due to a cavity below the road surface. A local was quoted as saying ?The whole area has been affected by sink holes for years - the ground has been moving around here for decades. I had a sink hole on my land in the 60s which would have been big enough to fit a double-decker bus in. In the last ten years, I?ve had two much smaller sink holes. On this occasion, the actual road has been affected."

There are a number of sites on the Cambrian Cave registry near here.

https://www.walesonline.co.uk/news/local-news/live-updates-main-gower-road-19023959

According to the council, these type of voids are quite common and are generally down to localised ground water erosion of the limestone.

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- from an update on the hole "the size of three terraced houses" found under a sagging section of road (so not (yet) a 'sinkhole'): https://www.walesonline.co.uk/news/local-news/sinkhole-size-three-houses-found-19031657

It would be interesting to know if the hole is actually into the limestone, or in the overlying glacial till...

Martin Laverty said:

It would be interesting to know if the hole is actually into the limestone, or in the overlying glacial till...

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It is in the limestone, is karst related, and is likely to be filled in at great expense soon. A certain well known Welsh digger is looking after speleological interests as well as possible in current circumstances.