Every state has passed multiple laws which dictate the manner in which drivers must operate their vehicles upon public roads. Many of these statutes are actually codified versions of the common law, while others are the result of legislative initiative.
The important point to remember is that a violation of any of these statutes generally creates a presumption of negligence as a matter of law. Thus, “fault” in an accident may be established merely by citing a statute that has been violated. A tortfeasor who is presumed to have caused an accident by virtue of a statutory violation must bear the burden, in any legal dispute, of proving that he or she was not negligent, or (in the alternative) that his or her negligence was not a proximate cause in the accident. The simplest way to apply the concept of proximate cause to an automobile accident is to ask whether it would be true that, “but for” the violation, the accident would not have occurred.