A truck’s black box — formally known as an Electronic Data Recorder or EDR — is one of the most powerful pieces of evidence in a truck accident case. In this video, triple board-certified attorney Marion Munley explains what it records and why preserving it immediately after a crash is essential.
What You’ll Learn
- What data does a truck’s EDR capture in the seconds before impact
- How Electronic Logging Device (ELD) data shows hours-of-service compliance
- Why black box data can disappear within days if not legally preserved
- How truck accident lawyers use temporary restraining orders to protect this evidence
Most commercial trucks are equipped with an EDR that continuously records vehicle data. Depending on the make and model, this typically includes vehicle speed in the seconds before impact, hard braking events, engine RPM, throttle position, seatbelt usage, and GPS location. Some trucks also record hours-of-service data through an Electronic Logging Device, which is required under FMCSA regulations and shows whether the driver was in compliance with federal driving-hour limits at the time of the crash.
The problem is that black box data is not stored indefinitely. Many systems overwrite earlier data after a relatively short period — sometimes within days. If you do not act quickly, that information can be gone before anyone knows it existed.
This is why one of the first actions a truck accident lawyer takes is filing a legal motion — often a temporary restraining order — to prevent the trucking company from accessing, altering, or destroying the truck’s data. Trucking companies know how valuable this information is. Without legal intervention, there is no guarantee they will preserve it voluntarily.
Marion Munley is triple board certified in Truck Accident Law, Civil Trial Law, and Civil Trial Advocacy. She is a member of the Academy of Truck Accident Attorneys’ Board of Regents and was the first woman to chair the American Association for Justice’s Trucking Litigation Group. Munley Law is the only firm in Pennsylvania with three board-certified truck accident lawyers.
Contact Munley Law for a free consultation. There is no fee unless we win.
