Can we change direction at the sight of this sign?
A)No, we can only continue straight ahead.
B)Yes, both to the right and to the left.Correct
C)Yes, as well as a U-turn.
The sign indicates that vehicles must travel in the direction indicated by the arrow, and travelling in the opposite direction is prohibited. This sign does not prohibit changing direction, but it does prohibit changing direction of travel (U-turn). On the other hand, the sign below does require us to follow the direction and sense it indicates.