Provincial Highway 19 (PH 19, Chinese: 台19線) is a north–south highway from Changhua City in Changhua County to Yongkang in Tainan City. The highway is known as Central Highway (中央公路). The highway lies between the coastal PH 17 and the inland PH 1 which serves many of the major cities in central and southern Taiwan. The total length of the highway is 140.195 kilometres (87.113 mi).[1]
Prov 19a: The highway connects the parent route in Yanshuei, Tainan City, with PH 17 in Zihguan, Kaohsiung County. The highway is also the longest spur routes in the provincial highway system. The total length is 78.693 kilometres (48.898 mi).