Loading
Loading
Review of Case Materials
Reviews records, documents, testimony, data, and other relevant materials and consults with counsel regarding technical issues related to the matter.
Provide Expert Analysis
Applies specialized knowledge and experience to evaluate the technical or professional issues involved.
Form Expert Opinions
Develops independent, supportable opinions based on the available evidence and relevant standards.
Prepare Expert Reports
Showing Results 0 of 0
Prepares clear, well-supported expert reports outlining methodology, analysis, findings, and opinions.
Provide Deposition Testimony
Explains findings and opinions under oath and responds to questioning during deposition testimony.
Testify in Court
Presents specialized findings and opinions clearly to judges, juries, arbitrators, or other decision-makers.
A vehicle acceleration expert witness may be useful when a case depends on how a vehicle gained or lost speed, what its motion was during a particular time interval, or whether the available evidence supports a claimed sequence of acceleration, braking, or impact. The analysis can involve pre-crash driving, disputed throttle or brake inputs, vehicle performance, or comparison of electronic records with video and physical evidence.
Available sources may include event data recorder information, vehicle speed records, accelerator or throttle information, brake status, GPS or telematics data, video, timestamps, scene measurements, and vehicle testing. NHTSA notes that EDRs can record technical information for brief periods before, during, and after crashes, including vehicle dynamics and driver inputs. Because EDR content and limitations vary, NHTSA also cautions that EDR evidence should be considered together with other available information rather than treated as a complete reconstruction by itself.
Video may support an acceleration analysis when the footage provides reliable timing and sufficient spatial references to establish vehicle positions over time. Those positions can be used to develop a speed history and, when the data permit, estimate changes in speed over successive intervals. The reliability of the result depends on factors such as frame timing, camera geometry, image quality, reference measurements, and the amount of visible vehicle travel. Published SAE research has specifically examined methods for deriving instantaneous speed and acceleration histories from surveillance video.
No. Acceleration describes how velocity changes with time, while delta-V describes the accumulated change in velocity over a specified interval. Under NHTSA's EDR terminology, longitudinal and lateral delta-V refer to cumulative changes in velocity recorded along those respective vehicle axes during the crash event. The two quantities are related, but they are not interchangeable and may answer different reconstruction questions.
