U.S. Route 150 (US 150) is a 571-mile (919 km) long northwest-southeast United States highway, signed as east–west. It runs from U.S. Route 6 outside of Moline, Illinois to U.S. Route 25 in Mount Vernon, Kentucky. Route description Illinois In the state of Illinois, U.S. 150 runs from the Quad City International Airport at U.S. Route 6 southeast to near Vermilion. U.S. 150 in Illinois is long. Between Moline and Danville, Route 150 closely parallels Interstate 74. Indiana In the state of Indiana, U.S. 150 runs south with U.S. Route 41 from Terre Haute. It is then concurrent with its parent, U.S. Route 50 from Vincennes to Shoals. It then runs east to New Albany before overlapping Interstate 64 into Kentucky. Between Vincennes and New Albany the road follows the original route of the Buffalo Trace. Kentucky U.S. 150 runs concurrently with I-64 as it enters Kentucky from Indiana, crossing the Ohio River into Louisville on the Sherman Minton Bridge and exiting the I-64 freeway at North 22nd Street in the Portland neighborhood. From there, U.S. 150 runs south to West Broadway (westbound U.S. 150 follows Dr. W. J. Hodges Street from West Broadway to West Main Street, then runs along the 22nd Street Connector to its merge with North 22nd near Garfield Avenue); U.S. 150 follows Broadway across downtown to Baxter Avenue; after a brief run along Baxter, It then follows Bardstown Road, a major radial artery running southeasterly from downtown, with interchanges at Interstates 264 and 265. Between West Main and West Broadway in Louisville, U.S. 150 is concurrent with U.S. Route 31W; from East Broadway and Baxter to Bardstown, Kentucky, it is concurrent with U.S. Route 31E. The route along Baxter Avenue and Bardstown Road follows the former Louisville and Bardstown Turnpike through the Highlands district of Louisville and past the historic Farmington plantation at the interchange with the Watterson Expressway (I-264). U.S. routes 150 and 31E separate at Bardstown near the Martha Layne Collins Blue Grass Parkway. U.S. 150 then continues southeast, around the city of Danville before terminating at Mount Vernon. History Illinois Before 1936, Illinois Route 39 ran from Bloomington to Champaign on the current routing of U.S. 150. In 1936, US 150 extended due northwest from Shoals, Indiana to the Quad Cities. As a result, IL 39 and IL 91 were decommissioned. Not only that, IL 16, IL 80, and IL 121 were