Stay safe and call 911 for a police report. See a doctor immediately, even if...

https://mag-wiki.win/index.php/What_Counts_as_Evidence_After_a_Car_Accident:_A_Paralegal%E2%80%99s_Guide

Stay safe and call 911 for a police report. See a doctor immediately, even if you feel fine. Take photos, get witness contact info, and never admit fault at the scene