The best thing you can do to find the truck is to take pictures of identifying marks on the truck before it drives off, specifically the license plate and DOT number. However, that is a challenge when you are dealing with the aftermath of a truck accident and may have serious injuries. So, if that is not possible, then try to at least identify the name of the trucking company. This is not hard, as the logo is usually written on the side or back of a truck. Once you are in a safe place, contact the police immediately so that you can make a report. Trucking companies are sophisticated entities with GPS on their trucks. Even if they will not admit it was their truck, down the line as our truck accident lawyers investigate your case, we can demand records from them. It is likely they will have GPS tracking showing that they had a truck in that location at the time of the accident.