Rapid Response by DRI

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.