Use CrashCompute with a clear, reviewable workflow

Open the Workbench, enter the case details, confirm US or Metric units, then choose a worksheet from the evidence you have. If you are unsure which method fits, use Choose a Tool.

Use the worksheet whose assumptions and required evidence match the case. A result is not reliable merely because all fields can be filled. Review the method notes and use an independent method when one is available.

No. Worksheet fields are part of the working session. Select Add to case file after reviewing the result to capture its inputs, provenance, uncertainty, formula, and worked solution.

Previously loaded worksheets and local browser work can remain available offline. Cloud saves, provider storage, account checks, live weather, and other network features require a connection.

It is the speed accounted for by the documented energy-loss evidence and stated assumptions. It may not include speed lost before the measured evidence began or through unmodeled mechanisms.

Use Investigation Source to identify where a material value came from, such as a total station, GNSS or RTK, scanner, photograph, EDR or CDR, vehicle inspection, drag test, roadway plan, witness information, or analyst assumption. Enter a plus-or-minus uncertainty only when it has a defensible basis, such as instrument tolerance, repeated measurements, or a documented analytical bound.

Use Range Runner to see the effect of supported low-to-high input bounds. Use Monte Carlo only when the probability distributions and relationships you select can be supported. Neither tool turns an unsupported range into evidence.

It surfaces Florida and FPSI or FHP terminology, the Florida yaw convention, center-of-mass radius guidance, FDOT references, and Florida-specific labels. It does not change valid physics or make a Florida convention appropriate outside its stated use.

It places supported methods side by side so you can see how conventions, assumptions, or design criteria affect the result. The explanation is part of the review. The tool does not choose the legally or scientifically appropriate method for the investigator.

The working session autosaves in this browser. A worksheet is not part of the organized Case File until you select Add to case file. A portable or cloud copy is created only when you choose Save.

Local browser autosave is the working copy. Device, Dropbox, OneDrive, and Google Drive saves create encrypted portable case files in storage you control. CrashCompute Cloud is a paid option for an encrypted case with controlled link sharing. See case storage help for provider details.

Portable case files and CrashCompute Cloud case contents are encrypted in the browser with the case password. CrashCompute cannot decrypt the case or recover a forgotten password.

New cloud cases start private. The owner can keep the case private or allow view or edit access. A recipient needs both the case link and password. Send them through separate channels.

CrashCompute cannot recover it or decrypt the case. Keep the password in an agency-approved password manager or other separate record, never only in the same message or folder as the case link or file.

Keep the encrypted editable case file for recovery and a fixed PDF or printed record for review. Retain source materials and any additional format required by agency policy.

No. CrashCompute documents arithmetic and method inputs. The investigator remains responsible for evidence classification, applicability, assumptions, interpretation, and reporting.

Email crash@crashcompute.com. Include the worksheet name, the step or wording involved, the expected behavior, and a screenshot when it can be shared without exposing sensitive case information.