In litigation and insurance investigations, distracted driving cases often turn on assumptions that the physical record is expected to support — but doesn’t always. Some are reasonable starting points. Others do not hold up against the physical record.
This article examines five of the most common and what a careful reconstruction requires to evaluate each one.
Myth 1: "Phone Records Prove Distraction"
They can confirm that a call was made, a message was sent, or data was exchanged. That provides context. But it does not establish that the activity caused the crash.
Timing also needs careful handling. Carrier records can differ in how time zones are applied, and the correct local time must be verified before comparing them to the crash timeline.
Just as important, these records reflect network activity — not how the phone was being used in real time. Their value comes from how they align with the rest of the evidence. Phone records are one part of the analysis. They must be considered alongside EDR data, physical evidence, and the reconstructed timeline — not read in isolation.
Myth 2: "Hands-Free Means Safe"
Hands-free calling is legal and, in many cases, an accurate description of what happened. But the device setting doesn’t close the investigation — the pre-crash behavior does.
Reconstruction looks at when braking began, whether steering inputs were made, and how speed changed before impact. Delayed braking, limited steering, or no meaningful speed reduction — where a response would be expected — can all be identified from EDR data and physical evidence at the scene.
The phone data shows what the device was doing. The EDR shows what the vehicle was doing. The analysis compares these timelines without assuming why a delay occurred.
Myth 3: "If It Was Visible, It Was Seen"
Visibility and perception are not the same.
A sight-line analysis establishes the earliest point at which a hazard was physically visible. Reconstruction then compares this visibility window against the driver’s actual inputs recorded by the EDR.
This answers a specific question: Did the driver initiate a response (braking or steering) during the time the hazard was visible? The analysis defines the window of opportunity; the EDR defines the timing of the response. Where a gap exists between the two, the full evidence determines what it means.
Myth 4: "Reaction Time Is Constant"
Road conditions, speed, visibility, and when a hazard came into view all shape what the evidence actually shows. These values are a reference — not a substitute for examining the specific event.
Reconstruction works backward from the physical record — EDR data, tire marks, steering inputs, crash geometry — to determine what this driver did and when. The analysis then compares what actually occurred against how a typical driver would be expected to respond given the same conditions. In distracted driving cases, that comparison often reveals a meaningful difference, and that is where the findings become significant.
Myth 5: "Driver Statements Are Reliable"
Statements taken at the scene are useful and worth documenting carefully. They give the driver’s account of the event. But accounts and records frequently diverge — on speed, on braking, on what happened in the seconds before impact.
When they do, reconstruction doesn’t choose a side. It looks at what the vehicle data, scene evidence, and damage patterns show, and works from there. The driver’s account remains part of the file — but where it conflicts with the instrument record, the evidence is what guides the finding.
The Standard of Expert Reconstruction
In accident reconstruction, no single data source should stand alone if additional evidence can be found. What reconstruction can do — and what TRC is retained to do — is establish the objective record: speed, response timing, and driver inputs.
When the evidence reveals a response profile that cannot be explained by road conditions, vehicle factors, or sight-line geometry alone, that finding warrants further examination of potential contributing factors — including but not limited to driver distraction.
At TRC Forensic Engineering, our opinions are bounded by what the evidence supports. That discipline is what makes our findings defensible — in depositions, in reports, and at trial.
