If you are involved in a traffic collision, you are required to complete and submit a written report to the DMV:

If a collision results in death, any minor or major injury, or more than $1,000 in damage to anyone's property, each driver involved must file a report with the DMV within 10 days. In some cases, the driver's insurance agent, broker, or legal representative may file the report to represent the driver.
DMV Writen Test