What is Delta-V in a car accident?

Delta-V is the change in velocity a vehicle experiences during a collision, measured in mph or kph. It is the single most important metric in crash reconstruction and injury causation analysis because it directly correlates with occupant injury risk.

How accurate is the Silent Witness Delta-V analysis?

More accurate than traditional reconstruction software, validated against NHTSA and IIHS crash test benchmarks. It uses physics-based modeling (crush energy, PDOF, principal direction of force) rather than generative estimation, and every submission is reviewed by an analyst.

Is the Delta-V analysis really free?

Yes. Submitting your photos for an analyst-reviewed Delta-V analysis is free. Full court-ready reports with biomechanical injury causation and expert-witness-grade documentation are available on our paid platform.

What photos work best for Delta-V estimation?

Clear photos showing the impact area from multiple angles work best. Include the full vehicle when possible and avoid photos with glare, heavy shadows, or partial occlusion. JPEG, PNG, WebP, or HEIC formats up to 25MB each, maximum 12 images.

Can I use the Delta-V analysis in court?

The free analysis is informational. For litigation, request our full report, which documents the methodology, validation data, calculations, assumptions, and error rate used by attorneys and expert witnesses to argue admission. Admissibility is decided by the court.

Free Analysis

Delta-V & Injury Analysis

Upload photos of the vehicle damage and a Silent Witness analyst will email you a defensible Delta-V range and injury assessment — usually within one business day.

Analyst-reviewed

Not an instant auto-estimate

1 business day

Emailed straight to you

Free analysis

No credit card needed

Delta-V & Injury Analysis

Upload car damage photos