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★★★★★
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Account login using a verified mobile phone number. Minor fixes to research charts. Added reconstruction time to the weather tool.
Rapid Response is the crash reconstruction toolkit built for forensic traffic analysts, collision investigators, and law enforcement professionals who need accurate math in the field — not back at the office. Built by the Driver Research Institute, Rapid Response puts 70+ peer-referenced formulas, case documentation tools, and crash-data lookups in one app, with results you can trust and export straight into a report. CALCULATIONS • 70+ formulas covering speed from skid/yaw, drag factor, braking, conservation of momentum, pedestrian throw, motorcycle and bicycle dynamics, lead-vehicle avoidance, perception-reaction time, and more • Switch instantly between US, SI, and UK unit systems • Auto-fill presets with tappable source citations linking straight to the underlying research • Step-by-step "working" breakdowns you can review, not just a final number • Built-in Monte Carlo sensitivity analysis for uncertainty ranges FIELD TOOLS • Scene Diagram — freehand scene sketching with adjustable point density, built for on-scene documentation • Photo Log — in-app camera with automatic GPS, timestamp, and case-note EXIF embedding • Vehicle Inspection — structured photo and note capture for post-crash vehicle documentation • VIN Doctor — decode a VIN and pull IIHS safety ratings • Case Manager — organize calculations, photos, and notes by case • Sun & Moon — lighting-condition lookups for time-of-crash visibility analysis CRASH DATA LOOKUPS • FARS Crash Lookup — search NHTSA's Fatality Analysis Reporting System • UK Crash Lookup — search UK Department for Transport STATS19 collision data REPORTING • Generate a clean PDF export of your calculations, complete with citations, ready to attach to a case file COMMUNITY • A professional forum to discuss cases, methods, and best practices with other reconstructionists Rapid Response is free to use during our launch period — no subscription required to access the full formula library, tools, and forum. Create a free account to get started. Rapid Response is a calculation and documentation aid. It does not constitute legal or engineering advice and is not a substitute for professional judgment or licensed expert testimony. See in-app Terms of Use for details.