Why is 10 points deducted for starting the engine in Subject 3?

[IrisRose]

In the Subject 3 driving test, failing to promptly release the ignition switch after starting the engine refers to not releasing the car key in time after ignition, which results in a 10-point deduction. The passing criteria for each subject test are as follows: 1. Subject 1: The full score for Subject 1 is 100 points, and a score of 90 or above is considered passing. 2. Subject 2: The full score for Subject 2 is 100 points. For large buses, tractors, city buses, medium-sized buses, and large trucks, a score of 90 or above is required to pass. For other vehicle types, a score of 80 or above is sufficient. 3. Subject 3: The road driving skills and safety and civilized driving knowledge tests in Subject 3 each have a full score of 100 points, and a score of 90 or above in each is required to pass.