 The entire route is part of the Jefferson Davis Highway, named after Civil War Confederate leader Jefferson Davis; with exception between North Augusta and Aiken, where US 1 was realigned, leaving SC 421 its section of the highway name.Markers of the highway dot all along the route, though most sections do have other road names too.Though US 1 connects to several urban areas in the state, it has fallen out of favor with most causal and business travelers not seeking to drive along a historic highway, as Interstate travel has generally become a much faster and more efficient means of ground transportation.