There are four elements of proof needed to show negligence. In a tractor-trailer truck accident case, they include:
Establishing that a duty of care was owed to you and other drivers on the road from the truck driver, their employer, and/or the truck’s owner
Providing evidence that the duty of care was breached, and led to an accident
Showing cause-and-effect, specifically that the breach of care caused your injuries
Describing the cost of those injuries in financial terms so the court can award monetary damages