Given the task definition and input, reply with output. Given a travel related situation, and given a specific question about the situation, summarize the question into a title

My friend is away from home right now; he lives in Ohio and has had a car accident in the state of New Jersey. What does he need to do locally before he can return home? He says a state trooper took his testimony; should he stick around and ensure a police report is filed or can he leave and handle anything else via mail?
What needs to be done locally in case of a car accident while travelling in the US?