An attorney should consider retaining a crash reconstruction expert when the cause, sequence, speed, visibility, driver response opportunity, roadway evidence, vehicle movement, or technical conclusions surrounding a collision are disputed or may materially affect the case. Early involvement can be especially valuable when evidence may later be altered, repaired, overwritten, or lost. A preliminary case review can also help determine whether a full reconstruction is actually necessary.

In many cases, yes. A nighttime visibility analysis may evaluate roadway geometry, available sight distance, street lighting, headlamp illumination, contrast, background conditions, vehicle positioning, traffic obstructions, and the location and orientation of the hazard. The goal is to determine what visual information may have been available to the driver and when the developing hazard may have become detectable or recognizable.

No. Speed is an important reconstruction factor because it affects distance traveled, available time, braking distance, and collision severity. However, avoidability also depends on when the hazard became detectable, available sight distance, lighting, traffic obstruction, lane position, roadway geometry, perception response considerations, and the physical opportunity to brake or steer. A speed violation by itself does not establish whether the driver had enough information, time, and distance to avoid the collision.

Perception response time refers to the period between the availability of a relevant hazard and the driver's initiation of a response. The process may include detecting the stimulus, recognizing what it represents, assessing the situation, selecting a response, and beginning that response. There is no single reaction-time value that automatically applies to every crash. The appropriate analysis depends on the circumstances of the event, the visual environment, the nature of the hazard, and the response required.

Important evidence may include police reports, scene photographs, vehicle photographs, roadway measurements, diagrams, surveillance video, dash camera footage, body worn camera video, traffic camera recordings, witness statements, EDR or CDR data, 3D scanner or point cloud data, drone imagery, vehicle inspection information, and prior expert reports. Original digital files should be preserved whenever possible because compressed copies, screenshots, or social media versions may remove information needed for technical analysis.

Yes. A preceding or adjacent vehicle can temporarily block a driver's view of a stopped vehicle, pedestrian, debris, or other roadway hazard. This is particularly important when the obstructing vehicle changes lanes or moves around the hazard shortly before impact. In those cases, the relevant question may be when the hazard first became sufficiently visible to the following driver, rather than the maximum sight distance measured on an empty roadway.

Sometimes. Video can support speed, time, distance, position, and movement analysis when the recording contains sufficient technical information. Factors such as frame rate, resolution, camera perspective, lens distortion, known reference dimensions, timing accuracy, and file compression all affect whether a reliable estimate can be made. TRI first evaluates the quality and limitations of the recording before determining whether a defensible video-based speed analysis is possible.

Yes. TRI can independently evaluate another reconstructionist's methodology, measurements, assumptions, calculations, diagrams, video analysis, physical evidence, and conclusions. The purpose is not to disagree simply because TRI was retained by another party. The question is whether the analysis and opinions are reasonably supported by the available evidence and accepted reconstruction principles.