Regardless of whether a truck driver flees or remains at the scene, you must always call the police. Not only will they need to complete an accident report, but they may be able to track down the truck driver as they begin their investigation.
Another wise step to take is to document the details of the accident as soon as you can and in much detail as possible. It is helpful to make notes describing the truck and the truck driver, if possible. Crucial information would include the trucking company, logos, identifying details, phone numbers, vehicle identification numbers, and license plate numbers.
If there are any witnesses, please speak with them and collect their contact information. Witnesses may offer another perspective on the accident and could have seen other identifying details. Also, look out for any surveillance cameras that may have recorded the incident.
Finally, it is recommended to contact an experienced Los Angeles truck accident attorney as soon as possible. A truck accident attorney is knowledgeable about truck accident investigations.