2q, i hope you are kidding. if someone is involved in a car accident the smartest and corect thing to do is call 911 and have a report filled out.otherwise someday the other driver can claim things that did not exist, most importantly that the person left the scene.
feel like gettting arrested for that? i would not want to.
follow the law…i’m pretty sure that your rabbi would feel that it is better than making a chilul Hashem by leaving the scene and then being arrested (perhaps in the middle of your Shabbos meal) when the cops run your plates and find you.