Drivers and experts return to assess dramatic traffic incidents from the UK motorways and roads across the globe, beginning with a look at what can happen when tyres and wheels fail. In California, a car is catapulted into the air, while a truck in Thailand suffers a tyre explosion, upending it and sending it spinning in front of a moving lorry.

Cameras focus on disasters caused by driving rain, from a motorcyclist in Thailand sliding uncontrollably down a flooded freeway, to a driver in Eastern Europe whose car slides out of control and somersaults towards a forest.