Ultimately, it is necessary to show that a defendant’s carelessness or recklessness was the source of the incident. This can be the result of breaking traffic law such as by tailgating or speeding. In other situations, a defendant is liable because of texting while driving or becoming distracted by food or drink. A St. Charles rear-end car accident lawyer could help to gather the evidence needed to show that a defendant was the sole party liable for the collision.