Legal analysis: It takes effect without my signature. After the traffic accident, the relatives or friends of both sides of the accident knew the situation at the scene of the accident and were entrusted by the person responsible for the accident to handle the specific matters of accident responsibility identification, so the letter of accident responsibility identification issued by the traffic police was signed effectively.

Legal basis: Article 93 of the Implementation Regulations of the Road Traffic Safety Law of the People's Republic of China, the traffic administrative department of the public security organ shall make a traffic accident determination within 10 days from the date of on-site investigation. If inspection and appraisal are needed, a traffic accident confirmation shall be made within 5 days from the date when the inspection and appraisal results are determined.