On a general road (not an expressway), you intend to make a U-turn at a point where U-turns are allowed. Which is the correct way to signal with the turn signal?

1. ①Turn on the right turn signal from at least 30 meters before the U-turn point.
2. ②Turn on the left turn signal from at least 30 meters before the U-turn point.
3. ③Turn on the left turn signal at the moment you start the U-turn.
4. ④Instead of the turn signal, turn on the hazard lights and make the U-turn.