First, stay calm. If there are injuries, call 911 immediately. Do not move your vehicle, unless you are in immediate danger and it would be safer to get your vehicle in a different location. You should get the name of the persons driving the other vehicles involved along with their phone number, driver's license, vehicle license and insurance information. Try to obtain any witness' name and phone numbers. Note the location, time and date. Use your camera phone to take pictures of the scene, vehicle damage and witnesses.