I recently found a very secret feature of cars. They all have this function but only very few people know how to use it and when to use it.
It is called, indicator or turn signal. It is a placed left side your steering wheel and usually shaped like a stick (Except Ferraris). And when you move this stick to up, right signal starts working and when you move this stick to down then the left signal starts working.
You use this stick a.k.a. indicator, when you intend to change a lane. As this feature is a very secret part of your car, I have placed a tutorial video for how to use indicator.
Use your indicators, people cannot communicate with telepathy!