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 Florida
U.S. Route 90 in the State of Florida is the northernmost west-to-east U.S. route in the state although it is one of the southernmost U.S. west-to-east routes in the rest of the United States. Highway 90 passes through the county seats of all 15 counties on its course in Florida, and is also the road upon which many of the county courthouses are located. It is never more than six miles (10 km) from I-10 throughout the state. It runs as a two-lane highway through most of the sparsely populated inland areas of the panhandle, becoming four-lanes through and near several towns. The speed limit is for all rural points west of Monticello, and it is on all rural points beginning in Madison County to Glen St. Mary.