Dai Davies, the former head of royal protection for the Metropolitan Police, says accidents like these are embarrassing for the service, but that training for officers is very rigorous.
More top news
There have been four deaths on the M4 in just the last eight days following crashes between Swansea and Newport.
A man who was being held at Parc Prison in Bridgend has died after being found in his cell by staff on Thursday.
A dry night with clear skies, but it will be followed by a really rather beautiful weekend!