If you witness a car accident and there is an injury, immediately call 911. Make victims as comfortable as possible, but do NOT move them. Moving an injured person can turn a minor injury into a serious one. Give your name to the police and to the parties involved in the accident. Make notes about what you personally saw. You may be called on to reconstruct the accident later; for example, by giving a recorded statement to an insurance company. In most circumstances, being a witness will not take much time and your information helps make the roads safer for everyone.