A preservation letter is a formal request directing the trucking company, motor carrier, insurer, or other responsible party to preserve evidence related to the crash. In a truck accident case, this may include black box data, electronic logging records, dashcam footage, maintenance records, driver qualification files, dispatch records, inspection reports, and cargo documents.
This matters because some evidence can be overwritten, repaired over, misplaced, or discarded if action is not taken quickly. A truck accident lawyer can send a preservation letter early to help protect critical proof before it disappears.