The purpose is to cultivate students' good driving awareness, so that students can obey the traffic rules and drive safely when they really drive on the road in the future.

Subject four is also called subject three, and common sense of safe and civilized driving is also called subject four theoretical examination and driver theoretical examination, which is a part of motor vehicle driver's license examination. After the implementation of OrderNo.. 139 the Ministry of public security of the people's Republic of China, subject 3 exam is divided into two contents. In addition to the road test, the common sense test of safety and civilization has also been added, commonly known as "subject four" and "car morality". Because this exam is conducted after subject three, everyone is used to calling it subject four exam. Actually, there is no subject four in the official statement.