After a wreck, prioritize safety and call 911 to get an official police report....

https://yenkee-wiki.win/index.php/How_Insurance_Companies_Decide_Who_is_at_Fault_(And_How_to_Build_Your_Case)

After a wreck, prioritize safety and call 911 to get an official police report. See a doctor immediately, even if you feel fine. Take plenty of photos, collect witness contact info, and watch what you say to insurance adjusters