After a crash, stay calm and move to safety. Call 911 immediately to ensure an...

https://wiki-global.win/index.php/What_If_the_Other_Driver_Changes_Their_Story_Later%3F

After a crash, stay calm and move to safety. Call 911 immediately to ensure an official police report is filed. Even if you feel okay, get a medical checkup right away. Take plenty of photos of the damage and collect contact info from witnesses