The highway originally continued up into the Central Mountain Range following the Dajia River ( 大甲溪 ) valley through the townships of Guguan ( 谷關 ) and Cingshan ( 青山 ) .
The highway used to go up into the Central Mountain Range along the Dajia River ( 大甲溪 ) valley through the townships of Guguan ( 谷關 ) and Cingshan ( 青山 ) .