One signature is enough for subject four, and students need to sign in the center for confirmation after completing the answer and passing the exam. 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. There are 50 questions in the examination paper, which are mainly presented in the form of cases, pictures and animations. 100 full score, 90 points qualified. The main contents include: safe and civilized driving operation requirements, safe driving knowledge in bad weather and complex road conditions, emergency handling methods such as tire puncture, and handling knowledge after traffic accidents. Million car purchase subsidy