Crash Investigation Unit follows the officers from the moment a call comes in, until the conclusion of a case months later, offering rare insight into the exhaustive and fascinating processes of evidence gathering, mechanical investigation, forensic testing and witness testimonies.

Balancing this forensic storytelling (including 3-D animations created from police laser-survey data) is the human, personal impact of road trauma: Families and friends share stories of lost loved ones; survivors reflect on luck and what they could, or should, have done differently; and witnesses relive the shock of what they saw.

Filmed by Greenstone in Sydney for the Seven Network, Crash Investigation Unit features teams of highly specialized police officers as they work to establish the causes of tragic incidents.