This may seem like an impossible task directly after an accident, yet is in your best interest to try and remain as calm as possible. When possible activate the hazard lights on your car, and stay in your car (if it is safe to do so), and make a call to an emergency service. Allow paramedics and EMT to examine you as soon as they arrive on the scene. At the time you might feel that you have only suffered very minor injuries, yet it is highly advisable to go for a full medical examination directly after the accident. If you had passengers in your car, they also need to go for an examination.
Avoid at all costs leaving or fleeing the accident scene before taking down all the necessary information that becomes essential if you want to go after a case. This information includes contact information and the names of every party involved along with any eyewitnesses.
When a law enforcement officer arrives at the scene, take down their badge number and their name. It is also important to take videos or snapshots of the accident scene. Make sure you take photos of every vehicle involved from several angles around each vehicle. Follow up by taking shots close-up of the impact points or of any other aspect that you may feel is important.
Never take on responsibility when it comes to the accident. This means not saying anything that seems innocuous such as “I am sorry” and avoid talking about what you believe or think happened with anyone else but a police officer or your insurance agent. You are under no obligation to discuss anything with the insurance providers of the liable party.