When and where are you required to turn on the direction indicator?

1. You should signal with the winker when you are 150 meters before the turn.
2. You should only signal before making right-hand and left-hand turns.
3. You should only signal when other passersby are near.
4. Correct answer: In such place and time that other road users can notice the given signal.

WhySignal in advance, at a distance that gives others time to see and understand it. There is no fixed 150 m.