Today, travelers driving east from Vandalia travel along modern U.S. 40 through south-central Illinois. The National Road continued into Indiana along modern U.S. 40, passing by the cities of Terre Haute and Indianapolis. Within Indianapolis, the National Road used the original alignment of U.S. 40 along West and East Washington Street (modern U.S. 40 is now routed along I-465). East of Indianapolis, the road went through the city of Richmond before entering Ohio, where the road continued along modern U.S. 40 and passed through the northern suburbs of Dayton, Springfield, and Columbus. West of Zanesville, Ohio, despite U.S. 40's predominantly following the original route, many segments of the original road can still be found. Between Old Washington and Morristown, the original roadbed has been overlaid by I-70. The road then continued east across the Ohio River into Wheeling in West Virginia, the original western end of the National Road when it was first paved. After running in West Virginia, the National Road then entered Pennsylvania. The road cut across southwestern Pennsylvania, heading southeast for about before entering Maryland. East of Keyser's Ridge, the road used modern Alternate U.S. 40 to the city of Cumberland (modern U.S. 40 is now routed along I-68). Cumberland was the original eastern terminus of the road. In the mid-19th century, a turnpike extension to Baltimore—along what is now Maryland Route 144 from Cumberland to Hancock, U.S. 40 from Hancock to Hagerstown, Alternate U.S. 40 from Hagerstown to Frederick, and Maryland Route 144 from Frederick to Baltimore—was approved. The approval process was a hotly debated subject because of the removal of the original macadam construction that made this road famous.