The function of vehicle tachograph is similar to the "black box" applied to aircraft

Its working principle is to record and update the road conditions in front of, in and around the vehicle through digital video. The information data includes recording in the vehicle, vehicle acceleration, steering and braking.

Tachograph is an instrument that records the image, sound and other relevant information of the vehicle during driving. After installing the tachograph, it can record the video image and sound of the whole process of vehicle driving, which can provide evidence for traffic accidents. People who like self driving can also use it to record the process of conquering difficulties and obstacles. While driving, I recorded the time, speed and location in the video, which is quite a "black box".