In Indiana, US Route 41 is a major route running near the western edge of the state, connecting the Chicagoland area, Terre Haute, Vincennes, and Evansville. The route enters Indiana at the very northwest corner of the state, crossing the Illinois border from Chicago on the same road as US Routes 12 and 20. The southern extent of US Route 41 is the main bridge over the Ohio River, connecting Evansville, Indiana, and Henderson, Kentucky; this bridge will soon be the site of Interstate 69's crossing over the great river there. US Route 41 is four-laned from Hammond all the way south to the Kentucky border, except for a section in west-central Indiana from a point near Williamsport south to Terre Haute; in this part of the corridor, Indiana Route 63 takes over as the high-speed four-lane expressway. Why wasn't US Route 41 put on the 4-lane expressway here instead, leaving Indiana Route 63 as the designation for the surface road currently occupied by US Route 41 in west-central Indiana? The answer is anyone's guess. From Terre Haute to Vincennes, US Route 150 runs concurrently with US Route 41. US Route 41 is very important to people in western Indiana.