Driving along the A541 dual carriageway at 8:33 am towards the junction of the B5444. Saw an object moving steadily across the sky which I could not identify. Was larger than a commercial airliner and had an unusual shape. Looked as though it was made up of three joined up triangles. Was pale white in colour and was luminescent similar to the Moon. I observed it for around 10 to 15 seconds, but was not able to take a photo on my phone as I was driving. I lost sight of the object, but then it was not visible on the trajectory which it had been taking previously. Looking on the map, I guess it was flying SW to NE over the Padeswood area, although given its size, it's hard to know just how far away it was.