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
Shortly after crossing the county line, US 90 continues to carry the name "Old Spanish Trail" where it enters the community of Bottle Branch and serves as the northern border of Eglin Air Force Base, although some private property occasionally can be found. Here the road serves as the northern terminus of State Road 285. Continuing along the northern edge of the base, US 90 and I-10 run parallel to each other, until the base territory ends, and I-10 moves to the southeast. In DeFuniak Springs, US 90 runs along the north side of the DeFuniak Springs Airport where it is joined in a concurrency with southbound US 331. After the airport US 90/331 runs along the north side of the DeFuniak Springs Country Club and then intersects a street named Baldwin Avenue, a city street with little importance other than the fact that it runs along the north side of the P&A Subdivision. This concurrency ends as US 331 turns south onto unmarked State Road 83 (Freeport Road), which joins US 90 as they both enter the DeFuniak Springs Historic District until it heads north onto North Ninth Street. US 90 doesn't leave the historic district until the intersection of Second Street, but it encounters three other local intersections after this. A sure sign that the road's presence in the city is coming to an end, is when it approaches the east end of Baldwin Avenue with Dorsey Avenue as the road curves to the northeast along the railroad tracks, eventually leaving DeFuniak Spring and turning more toward the east again.