Some reports said the IOPC has been informed so there must have been some police involment before the crash. But not the police chasing the car or it wouldn't have taken so long to find it.
I drove past the scene this morning (for work) all the screens are off the road, on the left-hand side as you come up the slip road from the A48 towards St Mellon's. If there was a chase from Newport they must have been on the wrong side of the road or crashed across both carriageways and then gone across the verge.