When you have been involved in a truck accident, the first thing most people should do is call emergency services and make sure to seek professional medical services for any injury you have from the accident. Truck accidents usually cause more severe injuries and damage and your health is the number one priority. So make sure you take care of your health first.
If you are physically able, you can check on any other possible victims and then wait for the police to get there. Always be sure to get medical treatment even if you do not believe you have sustained an injury, as some symptoms take time to develop. After your Truck accident, you should try and collect as much evidence as possible. You could also ask anyone who witnessed the accident to stay at the scene until the police arrive and take down statements from them if you are stable enough to do so safely.