National freeway 4 is a freeway that begins in Qingshui District, Taichung at Provincial Highway 17 and ends in Tanzi District at Provincial Highway 74. Length The total length is 28.0 km (17.4 miles). Major cities along the route Taichung City Exit List Lanes The lanes in each direction are listed below. 3 lanes: Qingshui Top - Fengshi IC 2 lanes: Fengshi IC-Tanzi System See also Highway system in Taiwan Notes Completed in November 2001. The Fengshi - Tanzi section was opened on 16 January 2023. References External links Taiwan Area National Freeway Bureau, MOTC Freeway No. 04