Your first priority should be your own safety and health. If you believe you have suffered a serious injury, summon medical assistance right away and seek treatment from an emergency room. If your injuries do not require immediate treatment, obtain as much information as possible (name, address, phone number, insurance information) from the other people involved in the crash as possible. If there are witnesses who say they saw the crash, obtain their names and contact information as well. If you have a smartphone with a camera, take photographs of the scene of the crash, the vehicles involved, your bicycle, and your injuries.