The method of turning on the taillights of the vehicle is: first, turn on the power of the car, start the car, and then turn on the light switch. Whether you turn on the high beam or the low beam, the taillights are automatically turned on with the use of the light. When driving at night, the taillights indicate that there is a car in front of the rear car, and show the positional relationship between the two workshops. The design principles of taillights are: 1. Have enough luminous intensity, so that the taillights can clearly identify the signal for drivers or pedestrians of other vehicles even in bright sunlight; 2. The light emitted by the taillights at night will not affect other vehicles The driver or pedestrian of the vehicle creates glare and discomfort.