Provincial Highway 3 () is a 435.608km long Taiwanese highway that starts in Taipei and ends in Pingtung. Also known as Inner-Mountain Highway (堧山堬路), the road travels through mountainous towns in Western Taiwan and was the major route for the area until Freeway 3 was built.
The route is also known as Zhongfeng Highway (ä¸Âè±Â堬路) between Longtan and Fengyuan, Zhongtan Highway (ä¸Âæ½Â堬路) between central Taichung City and Caotun, and Yunmi Armaments Road (æ¾Âå¯Âæ°åÂÂéÂÂè·¯) between Zhongpu, Chiayi and Nansi in Tainan City. Since the highway runs roughly parallel to Freeway 3 for the majority of its length, it is now primarily a highway providing local access as well as a scenic alternative route to the freeway.
The highway begins in Taipei City near the Executive Yuan. After a brief concurrency with PH 1 along Zhongxiao West Road (å¿ åÂÂ西路), highway 3 continues along Zhonghua Road (ä¸Âè¯路) and Heping West Road (Ã¥ÂÂ平西路) before leaving for Banqiao in New Taipei City via the Huajiang bridge (è¯æ±Âæ©Â). In Banqiao the highway is known as Wenhua Road (æÂÂÃ¥ÂÂè·¯), one of the busiest roads in the district. At Banqiao Station, the road had a brief concurrency with County Route 106 before turning south as Zhongshan Road (ä¸Â山路) and Sichuan Road (Ã¥ÂÂå·Âè·¯) towards Tucheng. The road goes through downtown Tucheng and bypassing downtown Sanxia before entering Taoyuan City.
In Taoyuan the highway passes through old town Daxi, which is also the terminus of North Cross-Island Highway (Ã¥ÂÂé¨橫貫堬路), or PH 7. After a brief concurrency with PH 4, the highways split in Daxi. Highway 3 continues southwest to Longtan before entering Hsinchu County.
In Hsinchu the highway serves as a scenic alternative to Freeway 3, passing through the rural parts of Guanxi, Hengshan, Zhudong, Beipu, Emei, and continues to Miaoli County. In Miaoli the highway has a brief concurrency with County Route 124 in Sanwan before highway 3 splits and continues south. The highway passes through mountainous townships of Shitan, Dahu, and Zhuolan before entering Taichung City.
In Taichung highway 3 passes through more mountainous districts in Dongshi, which is also the terminus of Central Cross-Island Highway (ä¸Âé¨橫貫堬路), also known as PH 8, and Shigang before entering Fengyuan, a suburb in northern Taichung. The highway then becomes an urban road, going through the suburb of Tanzi and central Taichung as Zhongshan Road (ä¸Â山路), Beitun Road (Ã¥ÂÂ屯路), Jinhua Road (é²åÂÂè·¯), and Jiancheng Road (建æÂÂè·¯). The highway then exits central Taichung and enters the southern suburbs of Dali and Wufeng before leaving for Nantou County.
Highway 3 is an important highway in Nantou, connecting Caotun and Nantou City, the two main population centers in the county. The highway then passes through Mingjian and Zhushan before entering Yunlin County. In Yunlin the highway goes through Linnei and bypasses downtown Douliu. After passing through Gukeng the highway enters Chiayi County. In Chiayi the highway connects the mountainous towns of Meishan, Zhuqi, Fanlu, Zhongpu, and Dapu. Beginning from Zhongpu to Nansi, the highway becomes a winding mountainous road known as the Yunmi Armaments Road (æ¾Âå¯Âæ°åÂÂéÂÂè·¯), as the road was initially built for wartime preparations. The highway passes through the Zengwen Dam in Dapu, the largest reservoir in Taiwan by volume, and enters Nansi in Tainan City.
In Tainan City, the highway goes through Nansi, Yujing, and Nanhua. The highway has a concurrency with PH 20 from Yujing to Nanhua before the latter turns east and becomes the Southern Cross-Island Highway (Ã¥ÂÂé¨橫貫堬路). Highway 3 then enters Kaohsiung City, passing through the downtowns of mountainous districts of Neimen and Cishan. Highway 3 then goes through Jiuru and Ligang in Pingtung County before ending at the intersection with PH 1 in Pingtung City.