Provincial Highway No. 21 (Taiwan)
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| 台21線 | ||||
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| Maintained by Directorate General of Highways | ||||
| Length: | 145.0 km (90.1 mi) | |||
| Major junctions | ||||
| North end: |
 PH 8 in Dongshi, Taichung City
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 Fwy. 6 in Puli
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| South end: |
 PH 18 in Xinyi, Nantou
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| Highway system | ||||
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Taiwan Provincial Highway No. 21 is a Provincial Highway in Taiwan that begins Tianleng (天冷), Dongshi District, Taichung City, at the intersection with Provincial Highway No. 8 (Central Cross-Island Highway), and ends at Tataka(塔塔加), where it is connected with Provincial Highway No. 18 (New Central-Crossing Highway) in Yushan National Park. It is the primary highway to the Sun Moon Lake, a popular tourist destination. The total length is 145 km.
A southern segment of the highway became Provincial Highway 29 in 2014. The segment was from Namaxia to Linyuan in Kaohsiung City, and ran along the Cishan River(旗山溪) as well as the Gaoping River(高屏溪). The road that connects both segments between Tataka and Namasia is not built due to environmental and ecological issues.
Provincial Highway No. 21 begins at Dongshi District, Taichung City, then passes through Guoxing, Puli, Yuchih, Sun Moon Lake, Shuili, Xinyi, and ended in Tataka. Its length is 149.126 km.
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