• Photograph vehicles, roadway conditions, signs, signals, and debris fields.
• Preserve event-data-recorder and telematics evidence where available.
• Send targeted preservation notices to vehicle owners, employers, insurers, repair facilities, and other custodians.
• Collect 911, dispatch, body-camera, dash-camera, and nearby surveillance evidence.
• Identify witnesses and record contact information promptly.

Evidence preservation should begin before liability positions harden and before damaged vehicles or digital records are lost.

Migration source: VictimsGuide Montana crash-investigation guide. Verify current Montana law and official authority before reliance.