U.S. Route 90
U.S. Route 90 (US 90) is an east–west United States highway. Despite the "0" in its route number, US 90 never was a full coast-to-coast route; it has always ended at Van Horn, Texas with the exception of a short-lived northward extension to US 62/US 180 near Pine Springs, Texas which lasted less than a year, and the signs on that segment were changed to Texas State Highway 54, traveling from Interstate 10 (I-10) at exit 140A and heading to its northern terminus at US 62/US 180.
U.S. Route 90 in Louisiana
The modern US 90 has its roots in an early 20th-century auto trail known as the Old Spanish Trail, which was designated as State Route 2 within Louisiana when the state first numbered its highway system in 1921. US 90 was applied to the route when the numbered U.S. Highway system was implemented in 1926. With minor exceptions, Route 2 generally remained co-signed with US 90 throughout the state until such overlapping between U.S. and state routes was eliminated in the 1955 Louisiana Highway renumbering. Prior to 1955, as US 90 was gradually relocated onto newer and improved alignments, Route 2 was often moved accordingly. Former alignments remaining in the state highway system were then designated as part of State Route 1092 with shorter pieces designated as Route 2-D, 2-E, and so on as needed.In Louisiana, current plans call for parts of U.S. 90 to be upgraded to interstate standards from Lafayette to just west of New Orleans and designated Interstate 49. The stretch of U.S. 90 to be upgraded to I-49 stretches from the West Bank Expressway (U.S. 90 Business near Westwego, Louisiana) to just north of downtown Lafayette, where U.S. 90 splits from U.S. Route 167 (the two highways converge in downtown Lafayette). The stretch of U.S. 167 from U.S. 90 to I-10 will also be upgraded and included as part of I-49. As of March 2008, due to a one billion dollar surplus in the Louisiana state budget, the legislature approved a bill which proposed capacity improvements on U.S. 90 in the Lafayette Area. U. S. 167/U.S. 90 is currently six-laned from I-10 in Lafayette to La 182 and La 96 in Broussard.