Start by checking if everyone is safe. Move your car out of traffic if...

https://extra-wiki.win/index.php/Why_Delaying_Medical_Care_Hurts_Your_Car_Accident_Claim

Start by checking if everyone is safe. Move your car out of traffic if possible. Always get a medical checkup immediately, even if you feel fine. Call the police to get an official report. Take photos of the scene and grab contact info from witnesses