The video shows probably the simplest automatic transmission built from LEGO bricks. It is two speed transmission and uses a friction clutch. Shifting is smooth and the transmission is also used in the LEGO car, as shown in the video. It is therefore really applicable. A GoPro camera mounted directly on the car was also used for recording to see the change of gears while driving in slow motion video. I designed this type of transmission by myself and I have never seen any such simple solution. If any of you know or have seen a similar transmission please let me know. Extra simple LEGO gadgets are my hobby. I hope you enjoy the video.