UPDATE: Police have confirmed eight vehicles were involved in the initial crash, which also included a police car.
Then three more cars collided with each other and another police car ended up being involved in the incident, with at least one more collision, taking the total up to 13 vehicles.
Only one male driver was injured and he was treated by the ambulance service for minor injuries.
The westbound carriage way is now open and police are working to clear the vehicles from the...
