No U-Turns Ahead Post Mount Sign - Dia. 614 R2/RA2 (Face Only)The no u turn sign is designed to stop vehicles from turning onto the other side where it may be dangerous to other vehicles. At junctions not controlled by traffic signals, the sign should be installed on the central refuge area facing the side which the restriction applies to. Without the central island, the sign should usually be on the left hand side of the road. This applies unless visibility would be poor, then it can be replicated or put on the