How long after passing Subject 3 will Subject 4 expire if not taken?

[VanEvangeline]

After passing Subject 3, the validity period is 3 years. If Subject 4 is not taken within 3 years, it will expire. Definition of Subject 4: After the implementation of the "Ministry of Public Security of the People's Republic of China Order No. 139", Subject 3 examination was divided into two parts. In addition to the road test, a safety and civilization knowledge test was added, commonly known as "Subject 4". Since this test is conducted after Subject 3, it is commonly referred to as the Subject 4 examination. Content of Subject 4 examination: Subject 4 mainly includes requirements for safe and civilized driving operations, knowledge of safe driving under adverse weather and complex road conditions, emergency handling methods for situations such as tire blowouts, and knowledge of handling traffic accidents.