In New Hampshire, fault in a car accident is determined based on the concept of negligence. The state follows a “modified comparative fault” rule, meaning that if you are found to be more than 50% at fault, you cannot recover damages. To establish fault, evidence such as police reports, witness statements, traffic laws, and accident scene analysis are crucial. Insurance companies and legal professionals often assess these factors to determine liability. It’s advisable to consult with a local attorney experienced in New Hampshire traffic laws to navigate the complexities of fault determination effectively.