National freeway 1, also known as Sun Yat-sen Freeway, is a freeway in Taiwan, the first freeway built in Taiwan. It begins in Keelung at the intersection of Xiao 2nd Road and Zhong 4th Road and ends in Kaohsiung at the intersection of Zhongshan 4th Road and Yugang Road, giving it a total length of 374.3 kilometres. The Republic of China government named the freeway Sun Yat-sen Freeway in honor of Sun Yat-sen, the country's founding father.
The construction began in 1971. The north section between Keelung and Zhongli was completed in 1974, and the entire highway was opened in 1978. A 20.7-kilometre viaduct on top of the freeway between Xizhi and Wugu was completed in 1997 in order to expand the capacity of the road.
Coordinates 23°40'52.694" N 120°27'52.487" E