If you are not allowed to turn left, you are not allowed to turn - If you are forbidden to turn, you are allowed to turn left (prohibited to turn left higher right)
Sign 1 is forbidden to turn left. This sign also prohibits turning (because the act of turning a car includes turning left and then turning the car to change the direction of going in the opposite direction).
Sign 2 is forbidden to turn the car in the shape of a U. This sign does not prohibit turning left to go to another road
Correct answer: 2 (Sea 2)