The subject three examination is divided into two parts. In addition to the road test, a safe and civilized driving test is added, commonly known as "subject four", which considers "car ethics". Because this exam is conducted after subject three, everyone is accustomed to calling it the subject four exam. There is no subject 41 theory in the actual official statement.

Subject 4, also known as Subject 4 theory test and driver theory test, is part of the motor vehicle driving license assessment.

The original exam consists of the theory test of subject 1, the pile test of subject 2, the electronic subject test, and the road test of subject 3. According to the Ministry of Public Security Order No. 123, there will be a theory test after the road test, because this test is in It takes place after subject three, so everyone is accustomed to calling it the subject four exam. In the actual official statement (i.e., Ministry of Public Security Order No. 123), there is no subject 41.

Subject 4 lists out the knowledge related to safe and civilized driving, safe driving skills under complex conditions, and emergency response in the original subject 1, and places it in the "Subject 3" actual road driving test. It will be carried out later to further test the candidates' traffic literacy level.