In this episode, could CCTV reveal the truth behind a fatal motorbike crash? And after a three-car crash in heavy rain, the team are left stunned by what they discover.

A four-car crash and a multi-emergency response - the team must act quickly to piece it together. And after a single-vehicle crash on the M4 on Christmas Day, they are suspicious that there is more to it than meets the eye, and turn to science to get to the truth.

When a tractor crashes into a family car on a busy city street, officers search for the truth behind the lies and get more than they bargained for when they reconstruct the events of the night.