Montesquieu concluded that the best form of government was one in which the legislative, executive, and judicial powers were separate and kept each other in check to prevent any branch from becoming too powerful. He believed that uniting these powers, as in the monarchy of Louis XIV, would lead to despotism.
Exceeding the speed limit is a matter of civil law. The civil law encompasses private relations between the members of a community.
The source of this law is a combination between an statute and a regulation.
The purpose of the law is to protect peoples right to safety. This is a term established in article 3 of the Universal Declaration of Human Rights.
If this law did not exist, government officials would be failing in their duty to secure the right to safety of the citizens of this country. Citizens would be exposed to worsened conditions while being driving a car or as a pedestrian.