2 (台2線) is an east-west, 167.674 km-long provincial Taiwanese highway that starts from the border of Taipei and Tamsui and ends in Su'ao, Yilan.

Although designed as an east-west route, the highway actually goes in north-south direction in Yilan County and parts of New Taipei City.

It bypasses through downtown Tamsui and continues along the northern coasts of Taiwan, passing through Sanzhi, Jinshan, and Wanli.

The highway continues along the coast, passing through Ruifang and Gongliao in New Taipei City.

It passes through rural and suburban townships of Toucheng, Zhuangwei, Wujie before ending at PH 9 in Su'ao.