Personal Injury
Accident Reconstruction / Black Box Data
THE EVIDENCE THAT DECIDES A CLAIM
What Your Vehicle Knows About Your Crash
Modern vehicles record objective data in the seconds before and during a crash. When fault is disputed, that data can matter more than anyone’s memory of what happened, and it often carries more weight with an insurance adjuster or a jury than either driver’s own account. Preserving it quickly, before it can be lost or overwritten, is frequently the difference between a claim built on evidence and one built on argument.
What Is "Black Box" Data?
Most vehicles built in the last two decades include an event data recorder, or EDR, commonly called a “black box.” It’s a small onboard computer that captures a short window of driving data whenever it detects a crash-like event, similar in concept to the recorders used in aircraft, just on a much smaller scale. Abood Law Firm has represented injured drivers and passengers across Michigan since 1956, and that same evidence-first approach applies to every collision case the firm takes on today.
WHAT EDR DATA CAN REVEAL
What a Black Box Typically Captures
An EDR download can show a detailed picture of the moments surrounding impact, often filling in gaps that witness accounts and police reports can’t. Because it’s an objective, machine-recorded account rather than a recollection formed under stress, it tends to carry significant weight when the two drivers involved describe the crash differently.
What EDR Data Typically Shows
- Vehicle speed in the seconds immediately before the collision
- Brake application and throttle position at the moment of impact
- Seatbelt use and airbag deployment timing
- Steering input and the vehicle's change in velocity (delta-V) during the crash
WHY YOU NEED TO ACT QUICKLY
Preserving the Evidence Before It's Gone
Black box data and scene evidence don’t last. EDR data can be overwritten by a later ignition cycle or lost entirely if a vehicle is repaired or sent to salvage before it’s downloaded, and surveillance footage from nearby businesses or traffic cameras is often erased on a rolling basis, sometimes within days. Acting early is one of the most important steps in building a strong reconstruction case — waiting even a few weeks to retain counsel can mean the strongest evidence in the case is already gone by the time anyone goes looking for it.
Preservation Letters
The firm sends formal preservation letters to at-fault drivers, insurers, and vehicle owners promptly after being retained, putting them on notice of a legal obligation to preserve EDR data and the vehicle itself before either can be lost. These letters are often the first substantive step taken on a new reconstruction case, ahead of any other filing.
Scene Evidence and Surveillance Footage
Alongside the electronic record, the firm works to secure skid marks, debris fields, and nearby surveillance or traffic camera footage before it’s gone — evidence that can corroborate or challenge what the black box shows, and that sometimes captures the collision itself.
WHY THIS EVIDENCE MATTERS WHEN FAULT IS DISPUTED
Michigan's Fault and No-Fault Rules
A motor vehicle collision claim in Michigan proceeds under the state’s No-Fault Act, MCL 500.3101 et seq. Personal Protection Insurance (PIP) benefits, which cover medical expenses and lost wages, are generally available regardless of fault. A separate claim against the at-fault driver for pain and suffering, however, requires proof that the injury meets the “serious impairment of body function” standard under MCL 500.3135 — and that second, third-party claim is where fault becomes central.
How Fault Percentage Affects Recovery
Michigan’s modified comparative fault rule can significantly affect that third-party claim: a plaintiff found more than 50 percent at fault is barred from recovering non-economic damages, and any percentage of fault reduces the total award proportionally. Because of this, an objective, evidence-based determination of fault is often central to the case, which is why black box and reconstruction evidence carry real weight — they can move a disputed percentage of fault in a client’s favor before a case ever reaches trial.
HOW ACCIDENT RECONSTRUCTION WORKS
Building the Full Picture
Black box data alone rarely tells the complete story. The firm works with accident reconstruction experts to analyze skid marks, vehicle crush patterns, debris fields, and roadway geometry, checking the electronic record against an independent physical analysis of the scene. Where the two sources agree, that agreement makes for a stronger case; where they diverge, understanding why is often just as important.
Connecting the Data to Your Injuries
The firm also works with biomechanical and medical experts to connect the forces recorded by the vehicle — delta-V, impact angle, restraint use — to the injuries a client actually sustained. That connection is often central to proving both causation and the severity of harm, particularly when an insurer argues that a client’s injuries are unrelated to the crash or pre-existing.
OBTAINING DATA AND MEETING MICHIGAN'S DEADLINES
Getting the Data, and the Clock You're Working Against
Under the federal Driver Privacy Act of 2015 (49 U.S.C. § 30129), EDR data is generally treated as the property of the vehicle’s owner. A client’s own vehicle data can usually be retrieved directly, though access can depend on the vehicle’s condition, the recorder’s compatibility, and whether the vehicle has already been repaired or totaled. Getting data from another driver’s vehicle is a different matter — it typically requires formal legal process, such as discovery under MCR 2.302, a subpoena to the manufacturer or a telematics provider, or a court order compelling production.
Statute of Limitations
Under MCL 600.5805, a claim for injury from a motor vehicle collision generally must be filed within three years of the accident. First-party No-Fault benefit claims are governed by a separate framework under MCL 500.3145, with its own notice and filing requirements. The firm tracks both deadlines from the outset of a case, since they run independently even though they arise from the same crash.
Preventing Spoliation
Michigan law recognizes a duty to preserve evidence once litigation is reasonably anticipated. Where a party destroys or loses black box data after that duty attaches, a court may impose sanctions under MCR 2.313, which can include an adverse-inference instruction depending on the circumstances. A prompt, written preservation notice sent early in the case strengthens this remedy considerably if the evidence is lost anyway.
JURISDICTIONAL CONTEXT
Advocacy Across Ingham and Oakland Counties
Reconstruction litigation benefits from counsel who knows the specific circuit court, claims adjusters, and expert community in a given jurisdiction — the reconstruction experts and defense firms encountered in one county are often different from those in another.
Ingham County and the 30th Circuit Court
Collision claims arising in the Greater Lansing area, including along US-127 and near Michigan State University, are litigated in the 30th Circuit Court. The firm’s East Lansing office provides direct familiarity with this docket and with the reconstruction experts and adjusters most often encountered there.
Oakland County and the Birmingham Office
In Southeast Michigan, reconstruction cases proceed through the 6th Circuit Court in Pontiac. The firm’s Birmingham office serves clients throughout Oakland County with the same evidence-first approach, built on years of litigating collision claims along the region’s busiest commuter corridors.
A serious collision claim deserves more than a quick read of the police report. If you’ve been in a crash and fault is in dispute, request a free case evaluation — the sooner the firm can act, the more evidence there is to work with, and the stronger the resulting claim tends to be.