Provincial Highway No. 5 (台5線) is a 28.7 km-long provincial

Province

A province is a territorial unit, almost always an administrative division, within a country or state.-Etymology:The English word "province" is attested since about 1330 and derives from the 13th-century Old French "province," which itself comes from the Latin word "provincia," which referred to...

 Taiwanese highway

Highway System in Taiwan

Highways in the Republic of China are classified into four types:# National highways: 1 - 10 # Provincial highways: 1 - 39, 61 - 88 # County routes: 101 - 205# Township routes-The numbering system:...

 that connects Taipei

Taipei

Taipei City is the capital of the Republic of China and the central city of the largest metropolitan area of Taiwan. Situated at the northern tip of the island, Taipei is located on the Tamsui River, and is about 25 km southwest of Keelung, its port on the Pacific Ocean...

 and its nearest port Keelung

Keelung

Keelung City is a major port city situated in the northeastern part of Taiwan. It borders New Taipei and forms the Taipei–Keelung metropolitan area, along with the Taipei and New Taipei. Nicknamed the Rainy Port for its frequent rain and maritime role, the city is Taiwan's second largest seaport...

. Before the expressway 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

Xizhi

Xizhi is a district in New Taipei City in northern Republic of China .In the past, the Xizhi area was the Kypanas locality of the Ketagalan Taiwanese aboriginals. The old name in Chinese refers to the fact that the tide from the Keelung River stops at Xizhi and goes back to the sea...

 and Keelung

Keelung

Keelung City is a major port city situated in the northeastern part of Taiwan. It borders New Taipei and forms the Taipei–Keelung metropolitan area, along with the Taipei and New Taipei. Nicknamed the Rainy Port for its frequent rain and maritime role, the city is Taiwan's second largest seaport...

.

Spur routes

• Highway 5A: This is the old segment of Highway 5 in Xizhi; the new section, now signed as Highway 5, is known as Xin Taiwu (New Highway 5) Road. The total length is 8.6 km.
• Highway 5B: This 2-km spur connects Highway 5A and National Highway 1
  National Highway No. 1 (Taiwan)
  National Highway No. 1 is the first freeway in Taiwan. It begins in Keelung City at the intersection of Ziao 2nd Road and Jhong 4th Road and ends in Kaohsiung City at the intersection of Jhongshan 4th Road and Yugang Road, giving it a total length of 372.8 km...
  
  , allowing trucks to bypass downtown Xizhi
  Xizhi
  Xizhi is a district in New Taipei City in northern Republic of China .In the past, the Xizhi area was the Kypanas locality of the Ketagalan Taiwanese aboriginals. The old name in Chinese refers to the fact that the tide from the Keelung River stops at Xizhi and goes back to the sea...
  
  .