Must combine both conditions of 30m advance warning and speed reduction.
Answer 2 is incorrect because of speeding up, Answer 3 is wrong because of lack of advance warning of 30m.
About 30m from the turn, slow down, there is a left turn signal, please change lanes; observe safety around, especially on the left; change to the left lane; for vehicles to slow down to the right In the center of the intersection, turn left to control the vehicle through the intersection.
About 30m from the turn, there is a left turn signal, speed up so that the car can quickly cross the intersection.
There is a signal to change lanes; observe safety around, especially on the left; change lanes to the right to widen the turn.