Defence counsel Joseph Mooney said the electrical engineer was in New Zealand on his honeymoon and had studied the New Zealand road rules before travelling here.
However, he accepted he had made mistakes behind the wheel.
Yu said when he was photographed on the wrong side of the road by a witness, he was attempting to pass another "very slow" vehicle in front of him, but realised his car didn't have enough power, so braked and pulled back in.
Judge Callaghan said one of the photos showed he was "clearly, completely in the wrong lane", with one vehicle travelling straight towards him and another in the correct lane, but ahead of him.
"There is no suggestion you were trying to pass at that stage.
"It just seems like you were on the completely wrong side of the road."
Judge Callaghan ordered the fines and costs to be paid immediately.