pretty sure they are standard on vehicles these days

turn signals or directionals if you prefer.
The little stick to the left of your steering wheel you can flip the stick upwards to indicate a right turn and conversely with a flick of the wrist downwards you can indicate a left turn. And the beauty part.....wait for it......the turn signal will turn itself off after you have completed your turn.
Similarly they can be used to indicate any sort of lane change you may be making unfortunately you will have to turn the directional off yourself in this case but it will making a click click click noise to remind that it needs to be turned off