Subject 4, also known as subject 4 theory test and driver theory test, is a part of motor vehicle driver's license assessment. After the implementation of the Ministry of Public Security 123 order, the subject three examination is divided into two contents. In addition to the road test, a safe and civilized driving test commonly known as "subject 4" has been added, and "car morality" has been considered. Because this exam is conducted after subject three, everyone is used to calling it subject four exam. There is no theme 4 1 in the actual official statement.