How does something happen automatically? I don’t think any thing can be automatic personally, someone or a robot has to do it.
I played a car game when I was a child and it had automatic gear changes but no idea how that is possible or maybe it simply changed gear when the car reached a certain revolution speed, it was a cool idea anyway and I still struggle to change gears properly in vehicles, I am glad though that someone invented the gear selectors on a steering wheel, that invention is awesome.