Provincial Highway 5 (Chinese: 台5線) is a 27.916 km-long provincial Taiwanese highway that connects Taipei and its nearest port Keelung. Before the freeway system was built, this was the primary route for goods transportation. The road is a major avenue (known as Zhongxiao East Road) in Taipei city, and is the north–south divide for the city. It also passes through downtown Xizhi and Keelung.

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Quick Facts Route information, Length ...

Provincial Highway 5
台5線
Taipei-Keelung Highway
Route information
Maintained by Directorate General of Highways
Length	27.916 km (17.346 mi)
Major junctions
South end	Prov 1 Prov 1a Prov 3 Prov 9 in Zhongzheng District, Taipei
Major intersections	Nat 3 in Xizhi
North end	Port of Keelung, Keelung
Location
Country	Taiwan
Highway system
Highway system in Taiwan
← Prov 4 → Prov 6

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The route begins at the intersection of Highway 1, 1a, 3, and 9 in front of Executive Yuan in Taipei. The highway continues along Zhongxiao East Road (忠孝東路), passing through downtown Taipei, before turning onto Academia Road (研究院路) and Nangang Road (南港路) in Nangang District. The road then exits Taipei where it enters Xizhi in New Taipei City. In Xizhi the road follows Xintaiwu Road (新台五路, literally "New PH 5 Road") heading towards Keelung, bypassing downtown Xizhi. In Keelung the highway passes through the communities of Wudu, Qidu and Badu before reaching the downtown. Once in downtown Keelung, the road runs concurrently with PH 2 until it reaches its terminus at Port of Keelung.

The highway runs parallel to the railroad lines connecting Taipei and Keelung for most of its length.

• Prov 5a: This is the old segment of Highway 5 in Xizhi. The route serves downtown Xizhi while the parent route bypasses it. The new section, now signed as Highway 5, is known as Xin Taiwu (New Highway 5) Road. The total length is 8.623 km.

• Prov 5b: This 2-km spur connects Highway 5A and National Highway 1, allowing trucks to bypass downtown Xizhi. The road was decommissioned in 2013.

• Highway system in Taiwan