A clear subject line should include your claim number and the date of the accident. Your letter should include a concise factual summary of the accident, an overview of your damages, your settlement demand, and not much more.A sample confirming letter is shown below. You can follow this format for almost any important (or seemingly important) piece of information. A demand letter serves as a formal request to the insurance company, outlining the incident, the injuries sustained, and the financial losses incurred. Method: Send your letter via Certified US Mail with signature confirmation and include the return receipt number at the top of your letter. Below is an example of a car insurance demand letter. Make sure to tailor it to your own accident and situation. If you are injured in a motor vehicle accident, file a written notice of claim with the No-Fault insurer that identify the injured person(s). In this comprehensive guide, we'll walk you through an example car accident settlement letter and break down its key elements.