National freeway 5 is a freeway in Taiwan, which begins in Taipei City at Nangang Junction on National freeway 3 and ends in Su-ao, Yilan on Masai Road. Although it was called the Beiyi Freeway (Chinese abbreviation for Taipei to Yilan) prior to its final completion in June 2006, the official name is the Chiang Wei-shui Memorial Freeway, after the early twentieth century Taiwanese political activist and Yilan native Chiang Wei-shui.

The lanes in each direction are listed below.

The speed limit in the Hsuehshan Tunnel section is 90 km/h.

The separation distance is 50 m.

Only a toll station named and located in Toucheng, Yilan County is now active. Other toll stations on interchanges are not working until fare changed to based on mileages.

As of July 2008, Toucheng Toll Station has started ETC service.

The section between Toucheng Township and Suao Township of Yilan County was completed in January 2006.

Hsuehshan Tunnel between Pinglin, Taipei and Toucheng, Yilan is 12.9 km long. It is the fifth longest road tunnel in the world.