If you ever have the unfortunate experience of being involved in an accident it is extremely important that you document everything! Never agree to just “settle things without police involvement.” Someone who admits fault to avoid calling the police is very likely to remember things differently when you present that person with a damage estimate a few days later.
We live in an age when even the most modest cell phone takes pictures. Photograph the final resting places of the vehicles as well as the property damage at the scene. If you are hurt go to the hospital right away. When you are at the hospital make sure that whoever is collecting information from you is clear about your complaints and the manner in which you were injured. And remember it is a prudent person who contacts a lawyer early so that they know their rights and obligations.