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.
Kentucky Route 90
Kentucky Route 90 begins at Cave City at an intersection with KY 70, equipped with a traffic light, in the one part of the city where many restaurants, hotels, and gas stations are located. It is a major tourism hot-spot due to the close proximity to Mammoth Cave National Park, in nearby Edmonson County, along with few other attractions along KY 70 west of the city. Signs at the I-65 exit tend to imply that KY 90 ends at the exit itself, while state highway documents indicate that the end is at the intersection with KY 70, about from the exit proper. In spite of this, both KY 70 and KY 90 markers appear on the signage for Exit 53 of I-65. After KY 90's first mile, it intersects U.S. Route 31W, still within city limits of Cave City.