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
US 90 enters Crestview itself where the divider ends at CR 188, but remains four-lanes wide. Further into the city, it runs along the border of the Crestview Commercial Historic District and then encounters an intersection with Main Street where West James Lee Boulevard becomes East James Lee Boulevard, and then intrersects State Road 85 and Courthouse Terrace on the southwest corner of that intersection. US 90 leaves the historic district at Industrial Drive, and then passes by Twin Hills Park on the south side, and the Okaloosa County Jail on the north side. At the intersection with Del Cerro Camino, the road changes from a four-lane undivided highway to a four-lane divided one. East of Crestview, US 90 remains four lanes wide as it crosses a bridge over Mandle Creek, but narrows down to a two lane undivided highway before crossing the bridge over the Shoal River. The rest of the way through the county it includes both names "East James Lee Boulevard" and "Old Spanish Trail," as it meanders around rural Okaloosa County. As it enters Killingsworth Crossorads, the road runs along the north side of the P&A Subdivision, but the tracks begin to move away momentarily as it enters Deerland, where it encounters the southern terminus of CR 393. The tracks return to the side of the road just west of the intersection of Mare Creek Drive, and will remain on this side even as both pass through some last developments hidden away on both sides before it crosses the Okaloosa-Walton County Line.