Columbia Canal, and Norfolk Southern's W Line on the Broad River Bridge. US 176 continues on the east side of the river as River Drive. At its junction with Clement Avenue and SC 16 (Sunset Drive), River Drive veers southeast and becomes two lanes. US 176 crosses over a CSX rail line before reaching an oblique intersection with Main Street, where the highway begins a lengthy concurrency with US 21 and US 321. The highways follow four-lane Main Street to the Elmwood Park Historic District, where the highways gain a fourth route, US 76, when they turn west onto six-lane divided Elmwood Avenue at the northern edge of downtown Columbia. One block to the west, the four U.S. Highways meet the western end of SC 48 (Assembly Street). A few blocks further to the west, Elmwood Avenue becomes a freeway carrying I-126 and US 76 west out of downtown Columbia; US 176, US 21, and US 321 exit the freeway at a full Y interchange onto six-lane divided Huger Street. South of another crossing of the W Line, the highways intersect the westbound and eastbound directions of SC 12 at Taylor Street and Hampton Street, respectively. South of their intersection with US 1 and US 378 (Gervais Street), US 176, US 21, and US 321 pass two blocks west of the Columbia Amtrak station before they reach Blossom Street, which carries US 21 Connector and US 76 Connector east through the University of South Carolina campus. The U.S. Highways follow four-lane divided Blossom Street west across the Congaree River out of the city of Columbia into Lexington County. Columbia to Goose Creek US 176, US 21, and US 321 follow Knox Abbott Drive, a four-lane street with center turn lane, west through the city of Cayce, where they intersect SC 2 (State Street) and SC 35 (12th Street). The highways briefly enter the city of West Columbia when they veer southwest onto Charleston Highway. The U.S. Highways pass under a rail line and have an oblique junction with SC 302 (Edmund Road) before re-entering Cayce. US 176, US 21, and US 321 become a divided highway as they pass historic Columbia Speedway, pass over another rail line, and meet the southern end of SC 2 (Frink Street) at a directional intersection that lacks a connection from the south-heading U.S. Highways to northbound SC 2. The U.S. Highways continue south as