Hsinchu City): (Xibin Highway, 西濱公路) 15A (PH 15 to PH 61 in Dayuan, Taoyuan City) 16 (Mingjian, Nantou - Xinyi, Nantou) 17 (Jianan, Taichung - Shuidiliao, Pingtung): (West Coast Highway) 17A (Annan, Tainan - Hunei, Kaohsiung) 17B (PH 17 to PH 17A in Annan, Tainan) 18 (Chiayi City - Tatajia, Xinyi): New Central Cross-Island Highway (新中橫公路) and Alishan Highway (阿里山公路) 19 (Changhua City - Tainan): Central Highway, (中央公路) 19A (Yanshuei, Tainan - Zihguan, Kaohsiung) 20 (Tainan - Haiduan, Taitung): Southern Cross-Island Highway, (南部橫貫公路) 20A (Chulai - Chishang) 20B (Zuozhen - Nanhua) 21 (Dongshi, Taichung - Tatajia, Xinyi) 21A (ring road around Sun Moon Lake) 22 (Nanzih, Kaohsiung - Gaoshu, Pingtung): Previously a portion of County Road 188 until 1993. 23 (Fuli, Hualien - Donghe, Taitung) 24 (Pingtung City - Wutai, Pingtung), Wutai Highway (霧台公路): Was Highway 22 until 1993. A section in Wutai was severely damaged in 2009 by Typhoon Morakot and has been shut down since. 25 (Fongshan District - Linyuan, Kaohsiung): Fenglin Highway (鳳林公路) 26 (Fenggang, Pingtung - Daren, Taitung) Ping-E Highway (屏鵝公路) and Jia-E Highway (佳鵝公路) 27 (Laonong, Kaohsiung - Wunong, Pingtung) 27A (Liouguei to PH 28) 28 (Hunei, Kaohsiung - Liouguei, Kaohsiung) 29 (Namasia, Kaohsiung - Linyuan, Kaohsiung) Dalin Highway (達林公路): Was a portion of Highway 21 until 2014. 30 (Zhuoxi, Hualien - Changbin, Taitung) 31 (Luzhu, Taoyuan - Xinwu, Taoyuan) 37 (Xingang, Chiayi - Lucao, Chiayi) 39 (Xinhua, Tainan - Alian, Kaohsiung) 61B (Shengang to national freeway 3, Hemei Interchange) 63A (PH 63 to PH 14 in Caotun, Nantou) Quasi Expressways 63 (South District, Taichung - Caotun, Nantou) (Zhongtou Highway, 中投公路) 68A (controlled-access) (PH 68 to County Road 123) 74A (controlled-access) (PH 74, Kuaiguan IC to PH 1 in Huatan, Changhua) Expressways 61 (Bali District - Xinwu District, Taoyuan City, Xiangshan, Hsinchu - Baishatun, Miaoli and Tongxiao, Miaoli - Fangyuan, Changhua, Dacheng, Changhua - Cigu, Tainan) (West Coast Expressway, 西濱快速道路) 61A (PH 15 to Port of Taipei): Absorbed into PH 61 in 2020. 62 (Dawulun, Keelung - Madong, Keelung and Ruifang District - Ruibin, New Taipei) 62A (Keelung Harbor to PH 62, Sijiaoting IC) 64 (Bali District - Zhonghe District) 65 (Wugu District - Tucheng District) 66 (Guanyin District, Taoyuan City - Daxi District, Taoyuan City) 68 (Nanliao, Hsinchu - Zhudong, Hsinchu) 72 (Houlong, Miaoli - Shitan, Miaoli) 74 (PH 3, Kuaiguan IC to PH 3, Wufeng IC) 76 (Puyan, Changhua - Caotun, Nantou) 78