The operator of a vehicle on a highway who intends to turn into a private road or driveway shall make the approach for the turn in the same manner as specified in s. 346.31 for vehicles making an approach for a right or left turn at an intersection. If, because of the size of the vehicle or the nature of the intersecting private road or driveway, the turn cannot be made from the specified lane of approach, the turn shall be made with due regard for all other traffic.