It is commonly known as Zhongtou (Taichung-Nantou) Highway.

However, the viaduct actually begins at 1.8 km (on Wuquan South Road).

63A) connecting to Bo-ai Road (Provincial Highway No.

This highway is no longer classified as an expressway on July 1, 2006.

[citation needed] Despite this lack of designation, it still functions as one.