The investigation by Yang Nanjun, an ancient trail researcher, confirmed that the preservation of the North Suhua Historic Trail was not as good as the other two trails. The main reason is that most of the uphill and downhill sections use timber steps, which are more prone to decay. Also, with the defense and attack of indigenous people, officials and others tend to take the safer sea route.
After his investigation, the Shigangzi trail between the south entrance of the Chongde Tunnel and Shigangzi is the most complete. Yang pointed out that the average width of the Shigangzai trail is 120 cm, and there are lower ridges at the cliffs. One of the broken rock zones is paved with stones to form a flat road with a width of 180 cm. It is one of the important landscape assets of Taroko National Park to provide a view of Qingshui Cliff directly into the Pacific Ocean.
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