27 years ago in the US: https://www.federalregister.gov/documents/2004/11/05/04-24737/federal-motor-vehicle-safety-standards-rear-impact-guards https://www.fed

27 years ago in the US: https://www.federalregister.gov/documents/2004/11/05/04-24737/federal-motor-vehicle-safety-standards-rear-impact-guards https://www.federalregister.gov/documents/2004/11/05/04-2473... ...and then updated two years later. Still watered down to the point of near uselessness in order to placate the trucking industry lobbyists.