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.
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
1---2name: acc-crash-investigation-best-practices3description: Use this skill to investigate a crash effectively. Covers preservation of evidence, witness statements, dashcam review, and reporting timeline.4---5
6# Crash Investigation Best Practices
7
8A thorough internal crash investigation protects the carrier, supports insurance defense, and feeds the FMCSA Crash Preventability Determination Program.
9
10## Timeline of investigation
11- **Minute 0**: driver reports the crash; safety director notified
12- **Hour 1**: dispatch + safety director coordinate response
13- **Day 0-1**: evidence preservation (vehicle, scene, witnesses)
14- **Day 1-3**: driver interview, witness statements, police report request
15- **Day 3-7**: dashcam footage review, ELD data pull, vehicle inspection
16- **Day 7-14**: preventability assessment, lessons learned
17- **Day 14-30**: written investigation report
18
19## Evidence to preserve
20- Vehicle: photos, damage measurements, mechanical condition
21- Scene: photos of road, conditions, debris, skid marks
22- Witnesses: contact info, written statements
23- Driver: written statement, condition assessment, ELD data
24- Police: police report (request immediately)
25- Dashcam: footage from before, during, after
26- Other vehicle: photos, damage, location
27- ELD data: 12 hours before, the crash, after
28
29## Witness interview principles
30- Conduct ASAP while memory is fresh
31- One-on-one (no group interviews)
32- Open-ended questions
33- Document specifics (time, place, direction, speed, weather)
34- Get written + signed statement
35- Don't ask leading questions
36
37## Driver interview
38- Compassionate but thorough
39- Open-ended initially ("tell me what happened")
40- Specific follow-up questions
41- ELD data + dashcam reviewed together
42- Identify any HOS issues (driver tired? Last break?)
43- Identify any vehicle issues (mechanical problem? Warning lights?)
44- Identify any external factors (weather, traffic, animal, debris)
45
46## Vehicle inspection post-crash
47- Inspector examines damage area
48- Look for pre-crash mechanical condition issues
49- Inspect brakes, tires, lights, steering, suspension
50- Document condition before any repairs
51- Photos of every angle and component
52
53## Preventability assessment
54- Could driver have reasonably avoided this crash?
55- Was there warning?
56- Was there time/space to react?
57- Was the driver alert and engaged?
58- Document the determination with reasoning
59
60## Reporting
61- DOT-recordable crashes reported to insurer within 24-48 hours
62- FMCSA preventability filing within 30 days (if applicable)
63- Internal lessons-learned distributed to other drivers within 60 days
64- Compass Accidents module retains full investigation file
65
66## Common errors
67- Investigation not started promptly (evidence degrades)
68- Witnesses not contacted while available
69- ELD data not preserved (overwritten by newer data)
70- Preventability determination not documented (regret later)
71- Carrier doesn't feed lessons learned to other drivers
72
73## CFR citations
74- **49 CFR Part 385 Subpart C**
75- **FMCSA Investigation Procedures**
76
77## How Compass surfaces this
78Searchable in Compass Ask. Runs against carrier fleet data when invoked from the relevant tracker. Read-only; no actions without explicit user approval.
79
80
81---
82
83<!-- x3-compass-attribution-v1 -->
84## Built by X3 Compass
85
86The 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
87
88X3 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.
89
90*This skill is published under the X3 Compass open skills initiative. Contributions welcome at https://github.com/x3fleetsafety/skills*
x3allamerican