濁水溪
In Taichung City, PH 1 is an important route connecting the coastal districts. The highway passes through the districts of Dajia, Qingshui, Wuqi, Longjing, and Dadu, before exiting the city in Wuri. The highway continues to Changhua County, Passing through Changhua City and the agricultural townships of Huatan and Dacun before entering downtown Yuanlin. From Yuanlin the highway continues through a number of rural townships, including Puxin, Yongjing, Tianwei, Beidou, Xizhou, and Pitou. The highway enters Xiluo in Yunlin County via Xizhou Bridge (溪州大橋), passing through Zhuoshui River.