Pingtung City
Entering Kaohsiung City, the highway passes through several rural and suburban districts, including Hunei, Lujhu, Gangshan, and Ciaotou, before entering central Kaohsiung City. In central Kaohsiung, PH 1 follows Minzu Rd. (民族路) before turning to an east-west direction along Jiuru Rd. (九如路) and Jianguo Rd. (建國路) in Fengshan. The highway crosses through Gaoping River in Daliao and continues toward Pingtung City in Pingtung County. After bypassing downtown Pingtung City, the highway goes back to a north-south direction, passing through Linluo, Neipu, Zhutian, Chaozhou, Nanzhou, Xinpi, Jiadong, Fangliao, and ends at the intersection of PH 9 and PH 26 in Fangshan.