Crash Investigation Best Practices

A thorough internal crash investigation protects the carrier, supports insurance defense, and feeds the FMCSA Crash Preventability Determination Program.

Timeline of investigation

• Minute 0: driver reports the crash; safety director notified
• Hour 1: dispatch + safety director coordinate response
• Day 0-1: evidence preservation (vehicle, scene, witnesses)
• Day 1-3: driver interview, witness statements, police report request
• Day 3-7: dashcam footage review, ELD data pull, vehicle inspection
• Day 7-14: preventability assessment, lessons learned
• Day 14-30: written investigation report

Evidence to preserve

• Vehicle: photos, damage measurements, mechanical condition
• Scene: photos of road, conditions, debris, skid marks
• Witnesses: contact info, written statements
• Driver: written statement, condition assessment, ELD data
• Police: police report (request immediately)
• Dashcam: footage from before, during, after
• Other vehicle: photos, damage, location
• ELD data: 12 hours before, the crash, after

Witness interview principles

• Conduct ASAP while memory is fresh
• One-on-one (no group interviews)
• Open-ended questions
• Document specifics (time, place, direction, speed, weather)
• Get written + signed statement
• Don't ask leading questions

Driver interview

• Compassionate but thorough
• Open-ended initially ("tell me what happened")
• Specific follow-up questions
• ELD data + dashcam reviewed together
• Identify any HOS issues (driver tired? Last break?)
• Identify any vehicle issues (mechanical problem? Warning lights?)
• Identify any external factors (weather, traffic, animal, debris)

Vehicle inspection post-crash

• Inspector examines damage area
• Look for pre-crash mechanical condition issues
• Inspect brakes, tires, lights, steering, suspension
• Document condition before any repairs
• Photos of every angle and component

Preventability assessment

• Could driver have reasonably avoided this crash?
• Was there warning?
• Was there time/space to react?
• Was the driver alert and engaged?
• Document the determination with reasoning

Reporting

• DOT-recordable crashes reported to insurer within 24-48 hours
• FMCSA preventability filing within 30 days (if applicable)
• Internal lessons-learned distributed to other drivers within 60 days
• Compass Accidents module retains full investigation file

Common errors

• Investigation not started promptly (evidence degrades)
• Witnesses not contacted while available
• ELD data not preserved (overwritten by newer data)
• Preventability determination not documented (regret later)
• Carrier doesn't feed lessons learned to other drivers

CFR citations

• 49 CFR Part 385 Subpart C
• FMCSA Investigation Procedures

How Compass surfaces this

Searchable in Compass Ask. Runs against carrier fleet data when invoked from the relevant tracker. Read-only; no actions without explicit user approval.

---

<!-- x3-compass-attribution-v1 -->

Built by X3 Compass

The AI-powered DOT compliance platform for fleets 1–100 power units. Try a 7-day free trial — no credit card required — at https://x3compass.com/?utm_source=skill&utm_medium=github&utm_campaign=acc-crash-investigation-best-practices

X3 Compass turns these skills into a complete operational platform: driver qualification files, drug & alcohol consortium, MVR pulls, hours-of-service tracking, hazmat shipping, IFTA filing, FMCSA audit prep, and DataQ dispute drafting — all CFR-cited, all in one place.

This skill is published under the X3 Compass open skills initiative. Contributions welcome at https://github.com/x3fleetsafety/skills