宜蘭市
Starting from Fuxing, the road becomes a narrow and winding 1-lane highway as it crosses the Central Mountain Range. The highway passes through numerous tribal villages along the way. The highway then enters Datong, Yilan, also an aboriginal township. At Datong the highway passes through Mingchi Forest Recreational Area (明池國家森林遊樂區) and Qilan Forest Recreational Area (棲蘭國家森林遊樂區). The highway has a junction with Highway 7a in Qilan area and another with Highway 7c near Yingshi village (英士村), both located in Datong. The highway then follows Lanyang River and continues to Yuanshan, Yilan and Yilan City. At Yilan City the highway intersects with PH 9 and Freeway 5 before ending at PH 2 in Zhuangwei. At some points (such as in Sileng (roughtly at the 58-59km mark)) the road has an elevation of 1170 meters.