The first important step you need to take is to call 911. If you are unable to make the call yourself, ask someone else to do it for you. Unless emergency services say otherwise, move your vehicle out of the way of traffic. While waiting for assistance, remain calm. After you check on everyone and move your vehicle, the next step is to swap information with other parties involved in the car accident. As long as it is safe to do so, take a lot of pictures and video of the scene.