Kaohsiung International Airport
The highway continues to parallel Freeway 1 as it travels along the eastern parts of Chiayi County and Tainan. Provicinal highways 82, 84, and 86 as well as National Freeway 8 provide connections between Freeways 1 and 3. In Kaohsiung the freeway bypasses the downtown area and travels along the mountainous rural districts. Connections to downtown and Kaohsiung International Airport are available through National Freeway 10, which the freeway intersects in the rural district of Yanchao, as well as Provincial Highway 88 in the urban township of Chaozhou in Pingtung County. After passing though the intersection with Freeway 10, the freeway enters Pingtung and ends in Dapengwan National Scenic Area in the rural township of Linbian. The southern stretch of the highway is known as the Southern Second Highway ().