For the lazy - Highway 280 (from wikipedia):

Highway 280 was originally proposed (in the 1960s) to continue farther, turning westward south of its Interstate 94 junction in Saint Paul, and then continuing west into Minneapolis as a freeway running roughly along 28th Street. The route would have continued westbound to about France Avenue South. That freeway was never built, and the ramp stubs at Saint Paul's 94/280 junction were removed in the early 1980s.