Right after a crash, stay calm and prioritize safety. Move to a safe spot, then...

https://wiki-dale.win/index.php/Is_a_Police_Report_Enough_to_Prove_What_Happened_in_My_Accident%3F

Right after a crash, stay calm and prioritize safety. Move to a safe spot, then call 911 for a police report. See a doctor immediately, even if you feel fine. Take pictures of the damage and grab contact info from witnesses