In Montana, fault in a car accident is determined based on negligence. The process involves gathering evidence such as police reports, witness statements, and accident scene photos to establish who acted carelessly or violated traffic laws. Montana follows a comparative negligence rule, meaning that if you are partially at fault, your compensation may be reduced by your percentage of fault. It’s crucial to consult with a local attorney who understands Montana’s traffic laws to effectively navigate the claims process and ensure fair compensation.