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 Texas
East of Downtown San Antonio, US 90 multiplexes with I-10. This overlap ends in Seguin, and continues where the two highways continually cross each other en route to Houston. US 90 once again duplexes with I-10 east of Columbus briefly separating near Brookshire and continue overlapping from Katy all the way to Houston. At I-610 east of Houston, US 90 becomes independently known as the Crosby Freeway.